ISL3331IRZ-T [INTERSIL]
3.3V, ±15kV ESD Protected, Dual Protocol RS-232/RS-485 Transceivers; 3.3V ，A ±15kV ESD保护，双协议RS - 232 / RS - 485收发器
| 型号： | ISL3331IRZ-T |
| 厂家： | 
Intersil |
| 描述： | 3.3V, ±15kV ESD Protected, Dual Protocol RS-232/RS-485 Transceivers |
| 文件： | 总25页 (文件大小：945K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ISL3330, ISL3331
®
Data Sheet
May 20, 2008
FN6361.0
3.3V, ±15kV ESD Protected, Dual Protocol
Features
(RS-232/RS-485) Transceivers
• User Selectable RS-232 or RS-485/RS-422 Interface Port
(Two RS-232 Transceivers or One RS-485/RS-422
Transceiver)
These devices are BiCMOS interface ICs that are user
configured as either a single RS-422/RS-485 differential
transceiver, or as a dual (2 Tx, 2 Rx) RS-232 transceiver.
• Operates From a Single 3.3V Supply
In RS-232 mode, the on-board charge pump generates
RS-232 compliant ±5V Tx output levels, from a supply as low
as 3.15V. Four small 0.1µF capacitors are required for the
charge pump. The transceivers are RS-232 compliant, with
the Rx inputs handling up to ±25V.
• ±15kV (HBM) ESD Protected Bus Pins (RS-232 or
RS-485)
• 5V Tolerant Logic Inputs
• True Flow-Through Pinouts Simplify Board Layouts
• Pb-Free (RoHS Compliant)
In RS-485 mode, the transceivers support both the RS-485
and RS-422 differential communication standards. The
RS-485 receiver features "full failsafe" operation, so the Rx
output remains in a high state if the inputs are open or
shorted together. The RS-485 transmitter supports up to
three data rates, two of which are slew rate limited for
problem free communications. The charge pump disables in
RS-485 mode, thereby saving power, minimizing noise, and
eliminating the charge pump capacitors.
• Full Failsafe (Open/Short) Rx in RS-485/RS-422 Mode
• Loopback Mode Facilitates Board Self Test Functions
• User Selectable RS-485 Data Rates . . . . . . . . . . 20Mbps
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
- Slew Rate Limited (ISL3331 Only) . . . . . . . . . . 115kbps
• Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps
• Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . 30µA
• QFN Package Saves Board Space (ISL3331 Only)
Both RS-232/RS-485 modes feature loopback and shutdown
functions. The loopback mode internally connects the Tx
outputs to the corresponding Rx input, which facilitates the
implementation of board level self test functions. The outputs
remain connected to the loads during loopback, where
connection problems (e.g., shorted connectors or cables)
can be detected. The shutdown mode disables the Tx and
Rx outputs, disables the charge pump if in RS-232 mode,
and places the IC in a low current (30µA) mode.
• Logic Supply Pin (V ) Eases Operation in Mixed Supply
L
Systems (ISL3331 Only)
Applications
• Gaming Applications (e.g., Slot machines)
• Single Board Computers
• Factory Automation
The ISL3331 is a QFN packaged device that offers
additional functionality, including a lower speed and edge
rate option (115kbps) for EMI sensitive designs, or to allow
longer bus lengths. It also features a logic supply voltage pin
• Security Networks
• Industrial/Process Control Networks
• Level Translators (e.g., RS-232 to RS-422)
• Point of Sale Equipment
(V ) that sets the V
level of logic outputs, and the
L
OH
switching points of logic inputs, to be compatible with
another supply voltage in mixed voltage systems. The QFN's
choice of active high or low Rx enable pins increases design
flexibility, allowing Tx/Rx direction control via a single signal
by connecting DEN and RXEN together.
Related Literature
• Application Note AN1401 “Implementing a Three Pin,
Half-Duplex, Dual Protocol Interface”
For a dual port version of these devices, please see the
ISL3332/ISL3333 data sheet.
TABLE 1. SUMMARY OF FEATURES
PART
NUMBER
NO. OF
PORTS
RS-485 DATA
RATE (bps)
RS-232 DATA
RATE (kbps)
ACTIVE H or L
Rx ENABLE?
LOW POWER
SHUTDOWN?
PACKAGE OPTIONS
V
PIN?
L
ISL3330
ISL3331
1
1
20 Ld SSOP
20M, 460k
400
400
No
H
Yes
Yes
40 Ld QFN (6mmx6mm) 20M, 460k, 115k
Yes
Both
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2008. All Rights Reserved.
1
All other trademarks mentioned are the property of their respective owners.
ISL3330, ISL3331
Ordering Information
PART NUMBER (NOTE)
PART MARKING
3330 IAZ
TEMP. RANGE (°C)
-40 to +85
PACKAGE (Pb-Free)
20 Ld SSOP
PKG. DWG. #
M20.209
ISL3330IAZ
ISL3330IAZ-T*
3330 IAZ
-40 to +85
20 Ld SSOP (Tape and Reel)
40 Ld 6x6 QFN
M20.209
L40.6x6
ISL3331IRZ
ISL3331IRZ
ISL3331IRZ
-40 to +85
ISL3331IRZ-T*
-40 to +85
40 Ld 6x6 QFN (Tape and Reel) L40.6x6
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J
STD-020.
Pinouts
ISL3330
(20 LD SSOP)
TOP VIEW
C1+
C1-
V+
1
2
20 C2+
19 C2-
3
18 V
CC
17 R
A
A
4
B
5
16 R
15 D
B
Y
Y
6
Z
7
14 D /SLEW
Z
485/232
DEN
GND
8
13 ON
9
12
RXEN
10
11 V-
ISL3331
(40 LD QFN)
TOP VIEW
40 39 38 37 36 35 34 33 32 31
V+
A
1
2
3
4
5
6
7
8
9
30
29
28
27
26
25
24
23
22
R
R
D
A
B
Y
B
Y
D /SLEW
Z
Z
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC 10
21 ON
11 12 13 14 15 16 17 18 19 20
FN6361.0
May 20, 2008
2
ISL3330, ISL3331
TABLE 2. ISL3330 FUNCTION TABLE
RECEIVER
OUTPUTS
DRIVER
SPEED
(Mbps)
CHARGE
PUMPS
(Note 1)
INPUTS
DRIVER OUTPUTS
LOOPBACK
(Note 2)
485/232
ON RXEN DEN SLEW
R
R
Y
Z
MODE
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
RS-232
Shutdown
RS-485
RS-485
RS-485
RS-485
RS-485
A
B
0
1
1
1
1
0
0
0
0
1
X
X
1
0
0
0
1
1
0
1
1
0
0
0
1
1
1
0
1
0
1
1
0
1
0
0
1
0
1
1
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
High-Z
High-Z
ON
High-Z
High-Z
ON
High-Z
ON
High-Z
ON
-
0.46
-
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
0
0
High-Z
ON
High-Z
ON
ON
0
ON
ON
0.46
0.46
0.46
0.46
-
ON
0
High-Z
High-Z
ON
High-Z
ON
ON
High-Z
High-Z
ON
ON
0
ON
ON
0
ON
ON
ON
X
High-Z
High-Z
High-Z
ON
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
High-Z
ON
High-Z
High-Z
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
1
X
-
1
1/0
X
20/0.46
-
1
High-Z
ON
High-Z
ON
1
1
1/0
1/0
ON
20/0.46
20/0.46
ON
ON
ON
NOTES:
1. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN are high.
2. Loopback is enabled when ON = 0, and DEN = RXEN = 1.
ISL3330 Truth Tables
RS-485 TRANSMITTING MODE
INPUTS (ON = 1) OUTPUTS
RS-232 TRANSMITTING MODE
INPUTS (ON = 1)
OUTPUTS
DATA RATE
(Mbps)
485/232 DEN
D
SLEW
Y
1
0
1
0
Z
0
1
0
1
Y
485/232
DEN
D
D
Y
Z
Y
Z
1
1
1
1
1
1
1
1
1
0
0
1
1
0
0
X
20
20
0
0
0
0
0
1
1
1
1
0
0
0
1
1
1
0
1
X
0
1
1
X
1
0
1
X
1
0
0.46
0.46
-
0
0
1
0
High-Z High-Z
High-Z
High-Z
RS-485 RECEIVING MODE
RS-232 RECEIVING MODE
INPUTS (ON = 1)
INPUTS (ON = 1)
OUTPUT
OUTPUT
485/232 RXEN
B-A
R
R
B
A
485/232
RXEN
A
B
R
R
B
A
1
1
1
1
1
1
1
0
≥ -40mV
1
High-Z
High-Z
High-Z
0
0
0
0
0
0
1
1
1
1
1
0
0
0
1
1
≤ -200mV
0
1
0
1
1
0
1
0
Open or Shorted together
X
0
1
High-Z High-Z
1
1
0
1
0
1
Open
X
Open
X
High-Z
High-Z
FN6361.0
May 20, 2008
3
ISL3330, ISL3331
TABLE 3. ISL3331 FUNCTION TABLE
RECEIVER
OUTPUTS
DRIVER
OUTPUTS
INPUTS
RXEN
DRIVER
DATA
RATE
CHARGE
PUMPS
(Note 3)
AND/OR
RXEN
485/232
ON
1
DEN
0
SLEW
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
SPB
N/A
N/A
N/A
N/A
N/A
N/A
N/A
X
R
R
Y
Z
(Mbps)
MODE
RS-232
A
B
0
1 and 0
1 and 0
0 or 1
High-Z High-Z High-Z High-Z
High-Z High-Z ON ON
High-Z High-Z
-
ON
ON
0
1
1
0.46
RS-232
0
1
0
ON
ON
ON
ON
-
ON
RS-232
0
1
0 or 1
1
ON
ON
ON
ON
ON
High-Z
High-Z
ON
0.46
ON
RS-232
0
0
1 and 0
0 or 1
1
High-Z High-Z
0.46
ON
RS-232
0
0
0
High-Z
ON
ON
ON
0.46
ON
RS-232
0
0
0 or 1
1
0.46
ON
RS-232 (Note 4)
Shutdown
RS-485
X
0
1 and 0
1 and 0
1 and 0
1 and 0
0 or 1
0
High-Z High-Z High-Z High-Z
High-Z High-Z High-Z High-Z
-
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
1
1
0
X
X
-
1
X
X
X
1
1
0
1/0
X
High-Z High-Z
High-Z High-Z
ON
ON
ON
ON
0.46/0.115
RS-485
1
1
1
20
RS-485
1
0
X
X
ON
ON
ON
ON
ON
High-Z High-Z High-Z
-
RS-485
1
0 or 1
1
0
1/0
X
High-Z
High-Z
High-Z
High-Z
ON
ON
ON
ON
ON
ON
ON
ON
0.46/0.115
20
RS-485
1
1
0 or 1
1
1
RS-485
1
1
0
0 or 1
1
0
1/0
X
0.46/0.115
20
RS-485 (Note 4)
RS-485 (Note 4)
0
0 or 1
1
1
NOTES:
3. Charge pumps are on if in RS-232 mode and ON or DEN or RXEN is high, or RXEN is low.
4. Loopback is enabled when ON = 0, and DEN = 1, and (RXEN = 1 or RXEN = 0).
ISL3331 Truth Tables
RS-485 TRANSMITTING MODE
INPUTS (ON = 1) OUTPUTS
485/232 DEN SLEW SPB
RS-232 TRANSMITTING MODE
DATA
Mbps
0.115
0.460
20
INPUTS (ON = 1)
OUTPUTS
D
Y
Z
Y
485/232
DEN
D
D
Y
Z
1
1
1
1
1
1
1
0
0
0
1
X
0
1
0/1
0/1
0/1
X
1/0
1/0
1/0
0/1
0/1
0/1
Y
Z
0
0
0
0
0
1
1
1
1
0
0
0
1
1
0
1
1
X
1
0
1
X
1
0
X
X
0
0
1
0
High-Z High-Z
-
RS-485 RECEIVING MODE
INPUTS (ON = 1)
High-Z
High-Z
OUTPUT
RS-232 RECEIVING MODE
INPUTS (ON = 1)
485/232 RXEN and/or RXEN
485/232 RXEN and/or RXEN
B-A
R
R
B
A
OUTPUT
1
1
1
0 or 1
0 or 1
0 or 1
≥ -40mV
≤ -200mV
1
High-Z
High-Z
High-Z
A
B
R
R
B
A
0
1
0
0
0
0
0
0
0 or 1
0 or 1
0 or 1
0 or 1
0 or 1
1 and 0
0
0
1
1
Open or Shorted
together
0
1
1
0
1
0
0
1
0
1
0
1
1
1 and 0
X
High-Z High-Z
1
1
Open
X
Open
X
High-Z High-Z
FN6361.0
May 20, 2008
4
ISL3330, ISL3331
Pin Descriptions
PIN
MODE
FUNCTION
485/232 BOTH Interface Mode Select input. High for RS-485 Mode and low for RS-232 Mode.
DEN
BOTH Driver output enable. The driver outputs, Y and Z, are enabled by bringing DEN high. They are high impedance when DEN
is low.
GND
NC
BOTH Ground connection.
BOTH No Connection.
ON
BOTH In RS-232 mode only, ON high enables the charge pumps. ON low, with DEN and RXEN low (and RXEN high if QFN), turns
off the charge pumps (in RS-232 mode), and in either mode places the device in low power shutdown. In both modes, when
ON is low, and DEN is high, and RXEN is high or RXEN is low, loopback is enabled.
RXEN
RXEN
BOTH Receiver output enable. Rx is enabled when RXEN is high; Rx is high impedance when RXEN is low and, if using the QFN
package, RXEN is high. When using the QFN and the active high Rx enable function, RXEN should be high or floating.
BOTH Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high and RXEN
is low. (i.e., to use active low Rx enable function, tie RXEN to GND). For single signal Tx/Rx direction control, connect RXEN
to DEN. Internally pulled high. (QFN only)
V
BOTH System power supply input (3.3V).
CC
V
BOTH Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. QFN logic input pins that are externally
L
tied high in an application, should use the V supply for the high voltage level. (QFN only)
L
A
RS-232 Receiver input with ±15kV ESD protection. A low on A forces R high; A high on A forces R low.
A A
RS-485 Inverting receiver input with ±15kV ESD protection.
RS-232 Receiver input with ±15kV ESD protection. A low on B forces R high; A high on B forces R low.
B
B
B
RS-485 Noninverting receiver input with ±15kV ESD protection.
RS-232 Driver input. A low on D forces output Y high. Similarly, a high on D forces output Y low.
D
Y
Y
Y
RS-485 Driver input. A low on D forces output Y high and output Z low. Similarly, a high on D forces output Y low and output Z high.
Y
Y
D /SLEW RS-232 Driver input. A low on D forces output Z high. Similarly, a high on D forces output Z low.
Z
Z
Z
RS-485 Slew rate control. With the SLEW pin high, the drivers run at the maximum slew rate (20Mbps). With the SLEW pin low, the
drivers run at a reduced slew rate (460kbps). The QFN version works in conjunction with SPB to select one of three RS-485
data rates. Internally pulled high in RS-485 mode.
SPB
RS-485 Speed control. Works in conjunction with the SLEW pin to select the 20Mbps, 460kbps or 115kbps RS-485 data rate.
Internally pulled high. (QFN only)
R
RS-232 Receiver output.
A
B
RS-485 Receiver output: If B > A by at least -40mV, R is high; If B < A by -200mV or more, R is low; R = High if A and B are
A
A
A
unconnected (floating) or shorted together (i.e., full fail-safe).
R
RS-232 Receiver output.
RS-485 Not used. Output is high impedance, and unaffected by RXEN and RXEN.
RS-232 Driver output with ±15kV ESD protection.
Y
RS-485 Inverting driver output with ±15kV ESD protection.
RS-232 Driver output with ±15kV ESD protection.
Z
RS-485 Noninverting driver output with ±15kV ESD protection.
C1+
C1-
C2+
C2-
V+
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed in RS-485 Mode.
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed in RS-485 Mode.
RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed in RS-485 Mode.
RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed in RS-485 Mode.
V-
FN6361.0
May 20, 2008
5
ISL3330, ISL3331
/
Typical Operating Circuits
+3.3V
+3.3V
+
+
0.1µF
18
0.1µF
18
1
1
3
C
0.1µF
C
1
0.1µF
C1+
V
3
C1+
V
CC
1
C
3
+
CC
C
0.1µF
+
+
+
+
V+
V-
3
+
V+
V-
0.1µF
2
2
C1-
C1-
20
20
C
0.1µF
C
2
0.1µF
2
C2+
C2+
11
17
C
4
11
17
C
4
19
4
19
0.1µF
C2-
C2-
0.1µF
+
+
4
R
A1
R
A
A
B
R
R
A
5kΩ
5kΩ
5kΩ
5
16
5
6
16
12
B1
R
R
B
R
R
B
5kΩ
LB
Rx
V
CC
RXEN
12
15
15
14
V
CC
RXEN
Y
Z
D
D
6
D
D
Y
Z
D
D
Y
Z
D
D
Y
Z
7
9
7
9
8
14
V
CC
V
DEN
CC
DEN
485/232
8
13
V
485/232
ON
CC
13
ON
GND
10
GND
10
NOTE: PINOUT FOR SSOP
NOTE: PINOUT FOR SSOP
RS-232 MODE WITHOUT LOOPBACK
RS-232 MODE WITH LOOPBACK
+3.3V
C
+3.3V
C
+
+
0.1µF
18
0.1µF
18
1
1
C1+
3
C1+
3
1
V
1
V
CC
CC
C
0.1µF
C
3
0.1µF
+
+
+
+
3
+
+
V+
V-
V+
V-
0.1µF
0.1µF
2
2
C1-
C1-
20
20
C
0.1µF
C
2
0.1µF
2
C2+
C2+
11
11
17
C
4
C
4
19
19
C2-
C2-
0.1µF
0.1µF
+
+
4
5
4
5
A
B
A
B
17
12
R
R
R
R
A
A
V
CC
RXEN
LB
Rx
16
15
12
16
15
R
D
B
Y
V
CC
6
7
RXEN
Y
Z
R
D
6
7
B
Y
D
Y
Z
D
14
13
SLEW
14
13
SLEW
9
8
9
8
V
CC
V
DEN
CC
DEN
V
V
485/232
ON
CC
CC
V
485/232
CC
ON
GND
10
GND
10
NOTE: PINOUT FOR SSOP
NOTE: PINOUT FOR SSOP
RS-485 MODE WITHOUT LOOPBACK
RS-485 MODE WITH LOOPBACK
FN6361.0
May 20, 2008
6
ISL3330, ISL3331
Absolute Maximum Ratings (T = +25°C)
Thermal Information
A
V
V
to Ground. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
CC
(QFN Only) . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to V
+ 0.5V
L
CC
20 Ld SSOP Package (Note 6) . . . . . .
40 Ld QFN Package (Notes 7, 8). . . . .
55
31
N/A
2.5
Input Voltages
All Except A,B. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Input/Output Voltages
A, B (Any Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V
Y, Z (Any Mode, Note 5). . . . . . . . . . . . . . . . . . . -12.5V to +12.5V
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range. . . . . . . . . -65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
R , R (Non-QFN Package) . . . . . . . . . . . -0.5V to (V
+ 0.5V)
R , R (QFN Package) . . . . . . . . . . . . . . . . -0.5V to (V + 0.5V)
A
B
CC
A
B
L
Operating Conditions
Output Short Circuit Duration
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Y, Z, R , R . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
A
B
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . See Specification Table
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
5. One output at a time, I
≤ 100mA for ≤ 10 minutes.
OUT
6. θ is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
JA
7. θ is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
JA
Tech Brief TB379.
8. For θ , the “case temp” location is the center of the exposed metal pad on the package underside.
JC
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C to C = 0.1µF, V = V (for QFN only), Unless Otherwise Specified.
CC
1
4
L
CC
Typicals are at V
= 3.3V, T = +25°C (Note 9)
CC
A
TEMP
MIN
MAX
PARAMETER
SYMBOL
TEST CONDITIONS
(°C) (Note 15)
TYP
(Note 15) UNITS
DC CHARACTERISTICS - RS-485 DRIVER (485/232 = V
)
CC
Driver Differential V
Driver Differential V
(no load)
V
V
Full
Full
Full
Full
-
-
2.3
2
V
V
V
V
V
OUT
OUT
OD1
OD2
CC
-
(with load)
R = 50Ω (RS-422) (Figure 1)
R = 27Ω (RS-485) (Figure 1)
2
1.5
1.5
5
5
V
R
= 60Ω, R = 375Ω, V = -7V to 12V
CM
-
OD3
D
(Figure 1)
Change in Magnitude of Driver
Differential V for
ΔV
R = 27Ω or 50Ω (Figure 1)
Full
-
0.01
0.2
V
OD
OUT
Complementary Output States
Driver Common-Mode V
V
R = 27Ω or 50Ω (Figure 1)
R = 27Ω or 50Ω (Figure 1)
Full
Full
-
-
-
3.0
0.2
V
V
OUT
Change in Magnitude of Driver
Common-Mode V for
OC
ΔV
0.01
OC
OUT
Complementary Output States
Driver Short-Circuit Current,
I
-7V ≤ (V or V ) ≤ 12V (Note 11)
Full
35
-
250
mA
OS
Y
Z
V
= High or Low
OUT
Driver Three-State Output Leakage
Current (Y, Z)
I
Outputs Disabled,
= 0V or 3.45V
V
V
= 12V
= -7V
Full
Full
-
-
-
150
-
µA
µA
OZ
OUT
OUT
V
CC
-150
DC CHARACTERISTICS - RS-232 DRIVER (485/232 = 0V)
Driver Output Voltage Swing
V
All T
Loaded with 3kΩ to Ground
= 0V
OUT
Full
Full
±5.0
-60
-
-
-
V
O
OUTS
Driver Output Short-Circuit Current
I
V
60
mA
OS
DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS)
Input High Voltage
V
V
V
V
V
V
= V
if QFN
Full
Full
Full
Full
25
2.2
2
-
-
-
-
-
V
V
V
V
V
IH1
IH2
IH3
IH4
IH5
L
CC
2.7V ≤ V < 3.0V (QFN Only)
L
2.3V ≤ V < 2.7V (QFN Only)
1.6
0.7*V
-
L
1.6V ≤ V < 2.3V (QFN Only)
L
L
1.2V ≤ V < 1.6V (QFN Only)
0.7*V
L
L
FN6361.0
May 20, 2008
7
ISL3330, ISL3331
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C to C = 0.1µF, V = V (for QFN only), Unless Otherwise Specified.
CC
1
4
L
CC
Typicals are at V
= 3.3V, T = +25°C (Note 9) (Continued)
CC
A
TEMP
MIN
MAX
PARAMETER
Input Low Voltage
SYMBOL
TEST CONDITIONS
(°C) (Note 15)
TYP
(Note 15) UNITS
V
V
V
V
V
V
V
V
= V
if QFN
Full
Full
Full
Full
25
-
-
-
-
-
0.8
V
V
IL1
IL2
IL3
IL4
IL5
IL6
IN1
IN2
L
L
CC
≥ 2.7V (QFN Only)
-
0.8
2.3V ≤ V < 2.7V (QFN Only)
-
0.7
V
L
1.6V ≤ V < 2.3V (QFN Only)
-
0.35*V
V
L
L
1.3V ≤ V < 1.6V (QFN Only)
0.35*V
-
-
V
L
L
L
1.2V ≤ V < 1.3V (QFN Only)
25
0.25*V
V
L
Input Current
I
I
Except SLEW, RXEN (QFN), and SPB (QFN)
Full
-2
-
-
2
µA
µA
SLEW (Note 13), RXEN (QFN), and SPB (QFN) Full
-25
25
DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (485/232 = V
)
CC
Receiver Differential Threshold
Voltage
V
-7V ≤ V
≤ 12V, Full Failsafe
Full
-0.2
-
-0.04
V
TH
CM
Receiver Input Hysteresis
ΔV
V
V
= 0V
25
-
-
35
-
-
0.8
-
mV
mA
mA
kΩ
TH
CM
CC
Receiver Input Current (A, B)
I
= 0V or 3.15V to 3.45V
V
V
= 12V
= -7V
Full
Full
Full
IN
IN
IN
-0.64
15
-
Receiver Input Resistance
R
-7V ≤ V
≤ 12V, V
= 0 (Note 12), or
-
-
IN
CM
3.15V ≤ V
CC
≤ 3.45V
CC
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (485/232 = GND)
Receiver Input Voltage Range
Receiver Input Threshold
V
Full
Full
Full
25
-25
-
-
25
0.8
-
V
V
IN
V
1.1
1.6
0.5
5
IL
V
2.4
-
V
IH
Receiver Input Hysteresis
Receiver Input Resistance
ΔV
-
V
TH
R
V
= ±15V, V
CC
Powered-Up (Note 12)
Full
3
7
kΩ
IN
IN
DC CHARACTERISTICS - RECEIVER OUTPUTS (485 OR 232 MODE)
Receiver Output High Voltage
V
V
V
V
I
I
I
I
I
= -1.5mA (V = V
if QFN)
Full
Full
Full
Full
Full
Full
V - 0.4
CC
-
-
V
V
OH1
OH2
OH3
OH4
O
O
O
O
O
L
CC
= -100µA, V ≥ 1.2V (QFN Only)
V - 0.1
L
L
= -500µA, V = 1.5V (QFN Only)
1.2
1.0
-
-
V
L
= -150µA, V = 1.2V (QFN Only)
L
-
V
Receiver Output Low Voltage
Receiver Short-Circuit Current
V
= 5mA
0.2
0.4
85
±10
V
OL
I
0V ≤ V ≤ V
7
-
-
mA
µA
OSR
O
CC
Receiver Three-State Output
Current
I
Output Disabled, 0V ≤ V ≤ V
(or V for QFN) Full
L
-
OZR
O
CC
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current (Note 10)
I
I
485/232 = 0V, ON = V
CC
Full
Full
Full
-
-
-
3.7
1.3
10
7
5
mA
mA
µA
CC232
CC485
485/232 = V , ON = V
CC
CC
Shutdown Supply Current
I
I
ON = DEN = RXEN = 0V
30
SHDN232
(RXEN = SPB = V if QFN)
L
ON = DEN = RXEN = SLEW = 0V
Full
-
30
60
µA
SHDN485
(RXEN = V , SPB = 0V if QFN)
L
ESD CHARACTERISTICS
Bus Pins (A, B, Y, Z) Any Mode
All Other Pins
Human Body Model
Human Body Model
Machine Model
25
25
25
-
-
-
±15
±2.5
±200
-
-
-
kV
kV
V
FN6361.0
May 20, 2008
8
ISL3330, ISL3331
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C to C = 0.1µF, V = V (for QFN only), Unless Otherwise Specified.
CC
1
4
L
CC
Typicals are at V
= 3.3V, T = +25°C (Note 9) (Continued)
CC
A
TEMP
MIN
MAX
PARAMETER
SYMBOL
TEST CONDITIONS
(°C) (Note 15)
TYP
(Note 15) UNITS
RS-232 DRIVER and RECEIVER SWITCHING CHARACTERISTICS (485/232 = 0V, ALL VERSIONS AND SPEEDS)
Driver Output Transition Region
Slew Rate
SR
R
= 3kΩ, Measured From 3V
C
C
≥ 15pF
Full
Full
Full
Full
Full
Full
25
-
20
12
30
V/µs
V/µs
µs
L
L
to -3V or -3V to 3V
≤ 2500pF
4
-
L
Driver Output Transition Time
t , t
R
R
= 3kΩ, C = 2500pF, 10% to 90%
0.22
1.2
1
3.1
r
f
L
L
Driver Propagation Delay
t
t
= 3kΩ, C = 1000pF (Figure 6)
-
2
µs
DPHL
DPLH
L
L
-
1.2
300
1200
500
25
2
µs
Driver Propagation Delay Skew
Driver Enable Time
t
t
- t
DPHL DPLH
(Figure 6)
-
450
ns
DSKEW
t
-
-
-
-
-
ns
DEN
Driver Disable Time
t
R
= 5kΩ, Measured at V = ±3V
OUT
25
-
-
ns
DDIS
L
Driver Enable Time from Shutdown
Driver Maximum Data Rate
t
V
= ±3.0V (Note 14)
25
µs
DENSD
DR
OUT
R
= 3kΩ, C = 1000pF, One Transmitter
Full
250
400
kbps
D
L
L
Switching
Receiver Propagation Delay
t
t
C = 15pF (Figure 7)
Full
Full
Full
Full
Full
Full
Full
Full
25
-
40
60
20
2
120
ns
ns
RPHL
RPLH
L
-
120
Receiver Propagation Delay Skew
Receiver Maximum Data Rate
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Output Low
Receiver Disable from Output High
t
t
- t
RPHL RPLH
(Figure 7)
-
40
-
ns
RSKEW
DR
C = 15pF
0.46
Mbps
ns
R
L
t
C
C
C
C
C
= 15pF, SW = V
(Figure 5)
-
-
-
-
-
18
18
22
22
60
-
ZL
L
L
L
L
L
CC
t
= 15pF, SW = GND (Figure 5)
-
ns
ZH
t
= 15pF, SW = V
(Figure 5)
-
ns
LZ
CC
= 15pF, SW = GND (Figure 5)
= 15pF, SW = V (Figure 5, Note 14)
t
-
ns
HZ
Receiver Enable from Shutdown to
Output Low
t
-
ns
ZLSHDN
CC
Receiver Enable from Shutdown to
Output High
t
C
= 15pF, SW = GND (Figure 5, Note 14)
25
-
20
-
ns
ns
ZHSHDN
L
RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), 485/232 = V , SLEW = V , ALL VERSIONS)
CC CC
Driver Differential Input to Output
Delay
t
, t
R
= 54Ω, C = 100pF (Figure 2)
Full
10
20
35
DLH DHL DIFF
L
Driver Output Skew
t
R
R
C
C
C
C
R
= 54Ω, C = 100pF (Figure 2)
Full
Full
Full
Full
Full
Full
Full
-
3
-
2
20
28
39
30
25
100
10
30
ns
ns
ns
ns
ns
ns
ns
SKEW
t , t
DIFF
L
Driver Differential Rise or Fall Time
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Output Low
Driver Disable from Output High
= 54Ω, C = 100pF (Figure 2)
L
R
F
DIFF
t
= 100pF, SW = V
CC
(Figure 3)
60
ZL
L
L
L
L
L
t
t
= 100pF, SW = GND (Figure 3)
= 15pF, SW = V (Figure 3)
-
60
ZH
t
-
60
LZ
CC
= 15pF, SW = GND (Figure 3)
= 500Ω, C = 100pF, SW = V
CC
-
60
HZ
Driver Enable from Shutdown to
Output Low
t
-
250
ZL(SHDN)
L
(Figure 3, Note 14)
Driver Enable from Shutdown to
Output High
t
R
= 500Ω, C = 100pF, SW = GND
Full
Full
-
290
35
375
-
ns
ZH(SHDN)
L
L
(Figure 3, Note 14)
Driver Maximum Data Rate
f
R
= 54Ω, C = 100pF (Figure 2)
20
Mbps
MAX
DIFF
L
RS-485 DRIVER SWITCHING CHARACTERISTICS (MEDIUM DATA RATE (460kbps), 485/232 = V , SLEW = 0V, SPB (QFN Only) = V , ALL
CC
CC
VERSIONS)
Driver Differential Input to Output
Delay
t
, t
R
= 54Ω, C = 100pF (Figure 2)
Full
200
500
1000
ns
DLH DHL DIFF
L
Driver Output Skew
t
R
R
= 54Ω, C = 100pF (Figure 2)
Full
Full
-
10
150
ns
ns
SKEW
t , t
DIFF
L
Driver Differential Rise or Fall Time
= 54Ω, C = 100pF (Figure 2)
300
660
1100
R
F
DIFF
L
FN6361.0
May 20, 2008
9
ISL3330, ISL3331
Electrical Specifications Test Conditions: V = 3.15V to 3.45V, C to C = 0.1µF, V = V (for QFN only), Unless Otherwise Specified.
CC
1
4
L
CC
Typicals are at V
= 3.3V, T = +25°C (Note 9) (Continued)
CC
A
TEMP
MIN
MAX
PARAMETER
SYMBOL
TEST CONDITIONS
(°C) (Note 15)
TYP
42
350
30
25
-
(Note 15) UNITS
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Output Low
Driver Disable from Output High
t
C
C
C
C
R
= 100pF, SW = V
CC
(Figure 3)
Full
Full
Full
Full
Full
-
-
-
-
-
100
450
60
ns
ns
ns
ns
ns
ZL
L
L
L
L
L
t
= 100pF, SW = GND (Figure 3)
= 15pF, SW = V (Figure 3)
ZH
t
LZ
CC
= 15pF, SW = GND (Figure 3)
= 500Ω, C = 100pF, SW = V
CC
t
60
HZ
Driver Enable from Shutdown to
Output Low
t
500
ZL(SHDN)
L
(Figure 3, Note 14)
Driver Enable from Shutdown to
Output High
t
R
= 500Ω, C = 100pF, SW = GND
Full
Full
-
-
750
-
ns
ZH(SHDN)
L
L
(Figure 3, Note 14)
Driver Maximum Data Rate
f
R
= 54Ω, C = 100pF (Figure 2)
460
2000
kbps
MAX
DIFF
L
RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps, QFN ONLY), 485/232 = V , SLEW = SPB = GND)
CC
Driver Differential Input to Output
Delay
t
, t
R
= 54Ω, C = 100pF (Figure 2)
Full
800
1600
2500
ns
DLH DHL DIFF
L
Driver Output Skew
t
R
R
C
C
C
C
R
= 54Ω, C = 100pF (Figure 2)
Full
Full
Full
Full
Full
Full
Full
-
250
1700
45
500
3100
100
1200
60
ns
ns
ns
ns
ns
ns
ns
SKEW
t , t
DIFF
L
Driver Differential Rise or Fall Time
Driver Enable to Output Low
Driver Enable to Output High
Driver Disable from Output Low
Driver Disable from Output High
= 54Ω, C = 100pF (Figure 2)
1000
R
F
DIFF
L
t
= 100pF, SW = V
CC
(Figure 3)
-
-
-
-
-
ZL
L
L
L
L
L
t
t
= 100pF, SW = GND (Figure 3)
= 15pF, SW = V (Figure 3)
910
35
ZH
t
LZ
CC
= 15pF, SW = GND (Figure 3)
= 500Ω, C = 100pF, SW = V
CC
29
60
HZ
Driver Enable from Shutdown to
Output Low
t
-
800
ZL(SHDN)
L
(Figure 3, Note 14)
Driver Enable from Shutdown to
Output High
t
R
= 500Ω, C = 100pF, SW = GND
Full
-
-
1500
-
ns
ZH(SHDN)
L
L
(Figure 3, Note 14)
Driver Maximum Data Rate
f
R
= 54Ω, C = 100pF (Figure 2)
Full
115
800
kbps
MAX
DIFF
L
RS-485 RECEIVER SWITCHING CHARACTERISTICS (485/232 = V , ALL VERSIONS AND SPEEDS)
CC
Receiver Input to Output Delay
Receiver Skew | t - t
t
, t
PLH PHL
(Figure 4)
(Figure 4)
Full
Full
Full
Full
Full
Full
Full
Full
20
-
45
3
70
10
-
ns
ns
|
t
SKEW
PLH PHL
Receiver Maximum Data Rate
Receiver Enable to Output Low
Receiver Enable to Output High
Receiver Disable from Output Low
Receiver Disable from Output High
f
20
-
40
15
15
20
20
500
Mbps
ns
MAX
t
C
C
C
C
C
= 15pF, SW = V
(Figure 5)
60
60
60
60
900
ZL
L
L
L
L
L
CC
= 15pF, SW = GND (Figure 5)
= 15pF, SW = V (Figure 5)
t
t
-
ns
ZH
t
-
ns
LZ
CC
= 15pF, SW = GND (Figure 5)
= 15pF, SW = V (Figure 5, Note 14)
-
ns
HZ
Receiver Enable from Shutdown to
Output Low
t
-
ns
ZLSHDN
CC
Receiver Enable from Shutdown to
Output High
t
C
= 15pF, SW = GND (Figure 5, Note 14)
Full
-
500
900
ns
ZHSHDN
L
NOTES:
9. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise
specified.
10. Supply current specification is valid for loaded drivers when DEN = 0V.
11. Applies to peak current. See “Typical Performance Curves” beginning on page 19 for more information.
12. R defaults to RS-485 mode (>15kΩ) when the device is unpowered (V
IN
= 0V), or in SHDN, regardless of the state of the 485/232 pin.
CC
13. The Slew pin has a pull-up resistor that enables only when in RS-485 mode (485/232 = V ).
CC
14. ON, RXEN, and DEN all simultaneously switched Low-to-High.
15. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
FN6361.0
May 20, 2008
10
ISL3330, ISL3331
Test Circuits and Waveforms
R
DEN
V
CC
Y
D
Y
V
R
D
D
OD
Z
+
-
V
CM
V
R
OC
FIGURE 1. RS-485 DRIVER V
AND V
TEST CIRCUIT
OC
OD
3V
0V
D
Y
1.5V
1.5V
PHL
C
= 100pF
= 100pF
L
t
t
PLH
DEN
V
CC
V
OH
Y
Z
D
Y
50%
50%
50%
OUT (Z)
R
DIFF
D
V
OL
C
L
t
t
PHL
PLH
SIGNAL
GENERATOR
V
OH
OUT (Y)
50%
V
OL
t
t
DLH
DHL
+V
OD
90%
10%
90%
10%
t
DIFF OUT (Z - Y)
0V
0V
-V
OD
t
R
F
SKEW = |t
PLH
(Y OR Z) - t
(Z OR Y)|
PHL
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FIGURE 2A. TEST CIRCUIT
DEN
DY
ENABLED
Y
Z
500Ω
3V
V
CC
DEN
D
1.5V
1.5V
HZ
GND
SW
SIGNAL
GENERATOR
0V
C
L
t
ZH
ZH(SHDN)
t
t
OUTPUT HIGH
2.3V
V
OH
V
- 0.5V
OH
OUT (Y, Z)
FOR SHDN TESTS, SWITCH ON AND DEN L- H SIMULTANEOUSLY
0V
PARAMETER OUTPUT
RXEN
DY
0/1
1/0
0/1
1/0
0/1
1/0
SW
C (pF)
L
t
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
X
X
X
X
0
GND
15
HZ
t
t
ZL
LZ
t
t
V
15
ZL(SHDN)
LZ
CC
V
CC
t
GND
100
100
100
100
ZH
OUT (Y, Z)
2.3V
t
V
V
+ 0.5V
V
ZL
CC
OL
OL
OUTPUT LOW
t
GND
ZH(SHDN)
t
0
V
CC
ZL(SHDN)
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3A. TEST CIRCUIT
FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES
FN6361.0
May 20, 2008
11
ISL3330, ISL3331
Test Circuits and Waveforms (Continued)
RXEN
+1.5V
-1.5V
V
CC
0V
15pF
B
0V
0V
A
B
R
A
R
t
PLH
t
PHL
V
CC
SIGNAL
GENERATOR
R
A
1.5V
1.5V
0V
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4A. TEST CIRCUIT
FIGURE 4. RS-485 RECEIVER PROPAGATION DELAY
RXEN
A
ENABLED
1.5V
1kΩ
V
3V
0V
R
CC
A
R
RXEN
1.5V
HZ
GND
SW
SIGNAL
GENERATOR
B
15pF
t
ZH
t
t
ZH(SHDN)
OUTPUT HIGH
1.5V
V
OH
- 0.5V
V
OH
FOR SHDN TESTS, SWITCH ON AND RXEN L- H SIMULTANEOUSLY
R
A
0V
PARAMETER
DEN
X
B (V)
+1.5
-1.5
SW
t
GND
HZ
t
t
ZL
LZ
t
t
X
V
ZL(SHDN)
LZ
CC
V
CC
OL
t
X
+1.5
-1.5
GND
ZH
R
A
1.5V
V
+ 0.5V
V
t
X
V
OL
ZL
CC
OUTPUT LOW
t
0
+1.5
-1.5
GND
ZH(SHDN)
t
0
V
CC
ZL(SHDN)
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5A. TEST CIRCUIT
FIGURE 5. RS-485 RECEIVER ENABLE AND DISABLE TIMES
3V
0V
DEN
D
V
1.5V
1.5V
Y,Z
CC
C
L
D
Y,Z
Y, Z
D
t
t
DPHL
DPLH
V
R
O+
L
SIGNAL
GENERATOR
OUT (Y,Z)
0V
0V
V
O-
SKEW = |t
- t |
DPHL DPLH
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6A. TEST CIRCUIT
FIGURE 6. RS-232 DRIVER PROPAGATION DELAY
3V
RXEN
A, B
A, B
V
50%
50%
CC
C
= 15pF
L
0V
R
R
B
A,
R
t
t
RPLH
RPHL
V
OH
SIGNAL
GENERATOR
R
R
B
A,
50%
50%
V
OL
SKEW = |t |
- t
RPHL RPLH
FIGURE 7A. TEST CIRCUIT
FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY
FIGURE 7B. MEASUREMENT POINTS
FN6361.0
May 20, 2008
12
ISL3330, ISL3331
RS-422 networks use a two bus, full duplex structure for
Detailed Description
bidirectional communication, and the Rx inputs and Tx
outputs (no tri-state required) connect to different busses, as
shown in Figure 9. The Tx and Rx enables aren’t required,
The ISL333x port supports dual protocols: RS-485/RS-422,
and RS-232. RS-485 and RS-422 are differential (balanced)
data transmission standards for use in high speed (up to
20Mbps) networks, or long haul and noisy environments.
The differential signalling, coupled with RS-485’s
so connect RXEN and DEN to V
CC
through a 1kΩ resistor.
Conversely, RS-485 is a true multipoint standard, which
allows up to 32 devices (any combination of drivers that must
be tri-statable and receivers) on each bus. Now bidirectional
communication takes place on a single bus, so the Rx inputs
and Tx outputs of a port connect to the same bus lines, as
shown in Figure 8. A port set to RS-485/RS-422 mode
includes one Rx and one Tx. See Application Note AN1401
for details about implementing a three pin, selectable
RS-232/half-duplex RS-485 port.
requirement for an extended common mode range (CMR) of
+12V to -7V make these transceivers extremely tolerant of
ground potential differences, as well as voltages induced in
the cable by external fields. Both of these effects are real
concerns when communicating over the RS-485/RS-422
maximum distance of 4000’ (1220m). It is important to note
that the ISL333x don’t follow the RS-485 convention
whereby the inverting I/O is labeled “B/Z”, and the non
inverting I/O is “A/Y”. Thus, in the application diagrams,
see Figures 8 and 9, the 333x A/Y (B/Z) pins connect to
the B/Z (A/Y) pins of the generic RS-485/RS-422 ICs.
RS-232 is a point-to-point, singled ended (signal voltages
referenced to GND) communication protocol targeting fairly
short (< 150’, 46m) and low data rate (<1Mbps) applications.
A port contains two transceivers (2 Tx and 2 Rx) in RS-232
mode.
The RS-422 is typically a point-to-point (one driver talking to
one receiver on a bus), or a point-to-multipoint (multidrop)
standard that allows only one driver and up to 10 receivers
on each bus. Because of the one driver per bus limitation,
Protocol selection is handled via the 485/232 logic pin.
GENERIC 1/2 DUPLEX 485 XCVR
RO RE
DE
DI
GENERIC 1/2 DUPLEX 485 XCVR
+5V
+3.3V
0.1µF
D
ISL333x
R
+
+
R
0.1µF
0.1µF
V
V
CC
CC
GND
RO
R
V
+5V
CC
RA
B
A
B/Z
RXEN*
RE
Tx/Rx
A/Y
DE
DEN
DY
Y
B/Z
DI
A/Y
D
D
Z
R
R
T
GND
GND
T
*QFN ONLY,
CONNECT RXEN TO GND
FIGURE 8. TYPICAL HALF DUPLEX RS-485 NETWORK
GENERIC 422 Rx (SLAVE)
RO RE
GENERIC FULL DUPLEX 422 XCVR (SLAVE)
+5V
0.1µF
+3.3V
R
+
+
ISL3330 (MASTER)
0.1µF
0.1µF
GND
V
+5V
CC
A
B
1kΩ
V
CC
V
R
T
CC
Z
RO
DI
A
B
D
R
DY
Y
DEN
RXEN
Z
Y
R
A
T
R
D
B
RA
GND
GND
FIGURE 9. TYPICAL RS-422 NETWORK
FN6361.0
May 20, 2008
13
ISL3330, ISL3331
DEN pin, in SHDN (see Tables 2 and 3, and the “Low Power
ISL333x Advantages
Shutdown (SHDN) Mode” on page 16), or when the 3.3V
power supply is off. Because RS-232 is a point-to-point (only
one Tx allowed on the bus) standard, the main use for this
DEN disable function is to reduce power by eliminating the
load current (approximately 1mA per Tx output) through the
5kΩ resistor in the Rx at the cable’s far end.
These dual protocol ICs offer many parametric
improvements vs those offered on competing dual protocol
devices. Some of the major improvements are:
• 3.3V Supply Voltage - Eliminates the 5V supply that
powers just the interface IC
• 15kV Bus Pin ESD - Eases board level requirements
• Full Failsafe RS-485 Rx - Eliminates bus biasing
CHARGE PUMPS
The on-chip charge pumps create the RS-232 transmitter
power supplies (typically +5.7/-5.3V) from a single supply as
low as 3.15V, and are enabled only if the port is configured
for RS-232 operation, and not in SHDN. The efficient design
requires only four small 0.1µF capacitors for the voltage
doubler and inverter functions. By operating discontinuously
(i.e., turning off as soon as V+ and V- pump up to the
nominal values), the charge pump contribution to RS-232
• Selectable RS-485 Data Rate - Up to 20Mbps, or slew
rate limited for low EMI and fewer termination issues
• High RS-232 Data Rate - >250kbps
• Lower Tx and Rx Skews - Wider, consistent bit widths
• Lower I
CC
- Max I is 2x to -4x lower than competition
CC
• Flow-Thru Pinouts - Tx, Rx bus pins on one side/logic
pins on the other, for easy routing to connector/UART
mode I
is reduced significantly. Unlike competing devices
CC
that require the charge pump in RS-485 mode, disabling the
charge pump saves power, and minimizes noise. If the
application is a dedicated RS-485 port, then the charge
pump capacitors aren’t even required.
• Packaging - Smaller (QFN) and Pb-free.
RS-232 Mode
RX FEATURES
DATA RATES AND CABLING
RS-232 receivers invert and convert RS-232 input levels
(±3V to ±25V) to the standard TTL/CMOS levels required by
a UART, ASIC, or µcontroller serial port. Receivers are
designed to operate at faster data rates than the drivers, and
they feature very low skews (20ns) so the receivers
contribute negligibly to bit width distortion. Inputs include the
standards required 3kΩ to 7kΩ pull-down resistor, so unused
inputs may be left unconnected. Rx inputs also have built-in
hysteresis to increase noise immunity and to decrease
erroneous triggering due to slowly transitioning input signals.
Drivers operate at data rates up to 400kbps, and are
guaranteed for data rates up to 250kbps. The charge pumps
and drivers are designed such that one driver can be
operated at the rated load, and at 250kbps (see Figure 33).
Figure 33 also shows that drivers can easily drive several
thousands of picofarads at data rates up to 250kbps, while
still delivering compliant ±5V output levels.
Receivers operate at data rates up to 2Mbps. They are
designed for a higher data rate to facilitate faster factory
downloading of software into the final product, thereby
improving the user’s manufacturing throughput.
Rx outputs are short circuit protected, and are tri-statable via
the active high RXEN pin, when the IC is shutdown (SHDN;
see Tables 2 and 3, and the “Low Power Shutdown (SHDN)
Mode” on page 16), or via the active low RXEN pin available
on the QFN package option (see “ISL3331 (QFN Package)
Special Features” on page 17).
Figures 36 and 37 illustrate driver and receiver waveforms at
250kbps, and 400kbps, respectively. For these graphs, one
driver drives the specified capacitive load, and a receiver.
RS-232 doesn’t require anything special for cabling; just a
single bus wire per transmitter and receiver, and another
wire for GND. So an ISL333x RS-232 port uses a five
conductor cable for interconnection. Bus terminations are
not required, nor allowed, by the RS-232 standard.
TX FEATURES
RS-232 drivers invert and convert the standard TTL/CMOS
levels from a UART, or µcontroller serial port to RS-232
compliant levels (±5V minimum). The Tx delivers these
compliant output levels even at data rates of 400kbps, and
with loads of 1000pF. The drivers are designed for low skew
(typically 12% of the 400kbps bit width), and are compliant to
the RS-232 slew rate specification (4V to 30V/µs) for a wide
range of load capacitances. Tx inputs float if left
RS-485 Mode
RX FEATURES
RS-485 receivers convert differential input signals as small
as 200mV, as required by the RS-485 and RS-422
unconnected and may cause I
results, connect unused inputs to GND.
increases. For the best
standards, to TTL/CMOS output levels. The differential Rx
provides maximum sensitivity, noise immunity, and common
mode rejection. Per the RS-485 standard, receiver inputs
function with common mode voltages as great as +12V and
-7V, regardless of supply voltage, making them ideal for long
networks where induced voltages are a realistic concern.
CC
Tx outputs are short circuit protected, and incorporate a
thermal SHDN feature to protect the IC in situations of
severe power dissipation. See the “RS-485 Mode” on
page 14 for more details. Drivers disable via the active high
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May 20, 2008
14
ISL3330, ISL3331
Each RS-485/422 port includes a single receiver (RA), and
the unused Rx output (RB) is disabled.
Drivers are also tri-stated when the IC is in SHDN, or when
the 3.3V power supply is off.
Worst case receiver input currents are 20% lower than the
1 “unit load” (1mA) RS-485 limit, which translates to a 15kΩ
minimum input resistance.
SPEED OPTIONS
The ISL3330 (SSOP) features two speed options that are
user selectable via the SLEW pin: a high slew rate setting
optimized for 20Mbps data rates (Fast), and a slew rate
limited option for operation up to 460kbps (Med). The
ISL3331 (QFN) offers an additional, more slew rate limited,
option for data rates up to 115kbps (Slow). See the “Data
Rate“ and “RS-485 Slew Rate Limited Data Rates” on
page 17 for more information.
These receivers include a “full fail-safe” function that
guarantees a high level receiver output if the receiver inputs
are unconnected (floating), shorted together, or if the bus is
terminated but undriven (i.e., differential voltage collapses to
near zero due to termination). Failsafe with shorted or
terminated and undriven inputs is accomplished by setting
the Rx upper switching point at -40mV, thereby ensuring that
the Rx recognizes a 0V differential as a high level.
Receiver performance is the same for all three speed
options.
All the Rx outputs are short circuit protected, and are
tri-statable via the active high RXEN pin, or when the IC is
shutdown (see Tables 2 and 3, and the “Low Power
Shutdown (SHDN) Mode” on page 16). ISL3331 (QFN)
receiver outputs are also tri-statable via an active low RXEN
input (see “ISL3331 (QFN Package) Special Features” on
page 17).
DATA RATE, CABLES, AND TERMINATIONS
RS-485/RS-422 are intended for network lengths up to 4000’
(1220m), but the maximum system data rate decreases as
the transmission length increases. Devices operating at the
maximum data rate of 20Mbps are limited to lengths of 20’ to
30’ (6m to 9m), while devices operating at or below 115kbps
can operate at the maximum length of 4000’ (1220m).
For the ISL3331 (QFN), when using the active high RXEN
function, the RXEN pin may be left floating (internally pulled
Higher data rates require faster edges, so both the ISL333x
versions offer an edge rate capable of 20Mbps data rates.
They both have a second option for 460kbps, but the
ISL3331 also offers another, very slew rate limited, edge rate
to minimize problems at slow data rates. Nevertheless, for
the best jitter performance when driving long cables, the
faster speed settings may be preferable, even at low data
rates. See the “RS-485 Slew Rate Limited Data Rates” on
page 17 for details.
high), or should be connected to V
through a 1kΩ resistor.
CC
If using the active low RXEN, then the RXEN pin must be
connected to GND.
TX FEATURES
The RS-485/RS-422 driver is a differential output device that
delivers at least 1.5V across a 54Ω load (RS-485), and at
least 2V across a 100Ω load (RS-422). The drivers feature
low propagation delay skew to maximize bit widths, and to
minimize EMI.
Twisted pair is the cable of choice for RS-485/RS-422
networks. Twisted pair cables tend to pick-up noise and
other electromagnetically induced voltages as common
mode signals, which are effectively rejected by the
differential receivers in these ICs.
To allow multiple drivers on a bus, the RS-485 specification
requires that drivers survive worst case bus contentions
undamaged. The ISL333x drivers meet this requirement via
driver output short circuit current limits, and on-chip thermal
shutdown circuitry. The output stages incorporate current
limiting circuitry that ensures that the output current never
exceeds the RS-485 specification, even at the common
mode voltage range extremes of 12V and -7V. In the event of
a major short circuit condition, devices also include a thermal
shutdown feature that disables the drivers whenever the die
temperature becomes excessive. This eliminates the power
dissipation, allowing the die to cool. The drivers automatically
re-enable after the die temperature drops about +15°C. If the
contention persists, the thermal shutdown/re-enable cycle
repeats until the fault is cleared. Receivers stay operational
during thermal shutdown.
The preferred cable connection technique is
“daisy-chaining”, where the cable runs from the connector of
one device directly to the connector of the next device, such
that cable stub lengths are negligible. A “backbone”
structure, where stubs run from the main backbone cable to
each device’s connector, is the next best choice, but care
must be taken to ensure that each stub is electrically “short”.
See Table 4 for recommended maximum stub lengths for
each speed option.
TABLE 4. RECOMMENDED STUB LENGTHS
MAXIMUM STUB LENGTH
SPEED OPTION
SLOW
ft. (m)
350 to 500 (107 to 152)
100 to 150 (30.5 to 46)
1 to 3 (0.3 to 0.9)
The RS-485 multi-driver operation also requires drivers to
include tri-state functionality, where the port has a DEN pin
to control this function. If the driver is used in an RS-422
network, such that driver tri-state isn’t required, then the
MED
FAST
DEN pin should connect to V
CC
through a 1kΩ resistor.
FN6361.0
May 20, 2008
15
ISL3330, ISL3331
Proper termination is imperative to minimize reflections
disables the charge pumps if the port is in RS-232 mode, so
V+ collapses to V , and V- collapses to GND.
when using the 20Mbps speed option. Short networks using
the medium and slow speed options need not be terminated,
but terminations are recommended unless power dissipation
is an overriding concern. Note that the RS-485 specification
allows a maximum of two terminations on a network,
CC
All but 10µA of SHDN I
current is due to control input
CC
(SPB, SLEW) pull-up resistors (~10µA/resistor), so SHDN
varies depending on the ISL333x configuration. The
I
CC
specification tables indicate the worst case values, but
careful selection of the configuration yields lower currents.
For example, in RS-232 mode the SPB pin isn’t used, so
otherwise the Tx output voltage may not meet the required
V
.
OD
In point-to-point, or point-to-multipoint (RS-422) networks,
the main cable should be terminated in its characteristic
impedance (typically 120Ω) at the end farthest from the
driver. In multi-receiver applications, stubs connecting
receivers to the main cable should be kept as short as
possible, but definitely shorter than the limits shown in
Table 4. Multipoint (RS-485) systems require that the main
cable be terminated in its characteristic impedance at both
ends. Again, keep stubs connecting a transceiver to the
main cable as short as possible (refer to Table 4). Avoid
“star”, and other configurations, where there are many
“ends” which would require more than the two allowed
terminations to prevent reflections.
floating it or tying it high minimizes SHDN I
.
CC
ISL3330
A
B
UART
R
RA
DY
OR
ASIC
Y
Z
D
OR
µCONTROLLER
FIGURE 10. ILLUSTRATION OF FLOW-THROUGH PINOUT
High ESD
All pins on the ISL333x include ESD protection structures
rated at ±2.5kV (HBM), which is good enough to survive
ESD events commonly seen during manufacturing. But the
bus pins (Tx outputs and Rx inputs) are particularly
vulnerable to ESD events because they connect to an
exposed port on the exterior of the finished product. Simply
touching the port pins, or connecting a cable, can destroy an
unprotected port. ISL333x bus pins are fitted with advanced
structures that deliver ESD protection in excess of ±15kV
(HBM), without interfering with any signal in the RS-485 or
the RS-232 range. This high level of protection may
When enabling from SHDN in RS-232 mode, allow at least
25µs for the charge pumps to stabilize before transmitting
data. If fast enables are required, and I
isn’t the greatest
CC
concern, disable the drivers with the DEN pin to keep the
charge pumps active. The charge pumps aren’t used in
RS-485 mode, thus the transceiver is ready to send or
receive data in less than 2µs, which is much faster than
competing devices that require the charge pump for all
modes of operation.
Internal Loopback Mode
eliminate the need for board level protection, or at the very
least will increase the robustness of any board level scheme.
Setting ON = 0, DEN = 1, and RXEN = 1 or RXEN = 0 (QFN
only), places the port in the loopback mode, a mode that
facilitates implementing board level self test functions. In
loopback, internal switches disconnect the Rx inputs from
the Rx outputs, and feed back the Tx outputs to the
appropriate Rx output. This way the data driven at the Tx
input appears at the corresponding Rx output (refer to
“Typical Operating Circuits” on page 6). The Tx outputs
remain connected to their terminals, so the external loads
are reflected in the loopback performance. This allows the
loopback function to potentially detect some common bus
faults such as one or both driver outputs shorted to GND, or
outputs shorted together.
Small Packages
Competing 3.3V dual protocol ICs are available only in a
20 Ld or 24 Ld SSOP. The ISL3331’s tiny 6mmx6mm QFN
footprint is 36% to 44% smaller than the competing SSOPs.
Flow-Through Pinouts
Even the ISL333x pinouts are features, in that the
“flow-through” design simplifies board layout. Having the bus
pins all on one side of the package for easy routing to a
cable connector, and the Rx outputs and Tx inputs on the
other side for easy connection to a UART, avoids costly and
problematic crossovers. Figure 10 illustrates the
flow-through nature of the pinout.
Note that the loopback mode uses an additional set of
receivers, as shown in the “Typical Operating Circuits” on
page 6. These loopback receivers are not standards
compliant, so the loopback mode can’t be used to implement
a half-duplex RS-485 transceiver. See Application Note
AN1401 for specific details on implementing a 3-pin, half
duplex, dual protocol port.
Low Power Shutdown (SHDN) Mode
The ISL333x enter the SHDN mode when ON = 0, and the
Tx and Rx are disabled (DEN = 0, RXEN = 0, and
RXEN = 1) and the already low supply current drops to as
low as 10µA. SHDN disables the Tx and Rx outputs, and
FN6361.0
May 20, 2008
16
ISL3330, ISL3331
.
TABLE 5. V AND V vs V FOR V
= 3.3V
ISL3331 (QFN Package) Special Features
IH
IL
L
CC
V
(V)
V
(V)
V
(V)
Logic Supply (V Pin)
L
IH
IL
L
The ISL3331 (QFN) includes a V pin that powers the logic
1.2
1.5
1.8
2.3
2.7
3.3
0.85
0.9
0.9
1.2
1.4
1.8
0.26
L
inputs (Tx inputs and control pins) and Rx outputs. These
pins interface with “logic” devices such as UARTs, ASICs,
and µcontrollers, and today many of these devices use
power supplies significantly lower than 3.3V. Thus, a 3.3V
output level from a 3.3V powered dual protocol IC might
seriously overdrive and damage the logic device input.
0.5
0.73
1.0
1.3
1.7
Similarly, the logic device’s low V
might not exceed the
OH
of a 3.3V powered dual protocol input. Connecting the
V
IH
V pin to the power supply of the logic device (as shown in
Note: With V ≤ 1.6V, the ISL3331 may not operate at the full
L
L
data rate unless the logic signal V is at least 0.2V below
the typical value listed in Table 5.
IL
Figure 11) limits the ISL3331’s Rx output V
to V (see
OH
L
Figure 14) and reduces the Tx and control input switching
points to values compatible with the logic device output
levels. Tailoring the logic pin input switching points and
output levels to the supply voltage of the UART, ASIC, or
µcontroller eliminates the need for a level shifter/translator
between the two ICs.
The V supply current (I ) is typically less than 35µA, as
shown in Figures 19 and 20. All of the DC V current is due
to inputs with internal pull-up resistors (SPB, SLEW, RXEN)
being driven to the low input state. The worst case I current
L
L
L
L
occurs when all three of the inputs are low (see Figure 19),
due to the I through the pull-up resistors. I through an
L
IL
V
= +3.3V
V
= +2V
CC
CC
input pull-up resistor is ~10µA, so the I in Figure 19 drops
L
by about 18µA (at V = 3.3V) when the SPB is high and 232
L
mode disables the SLEW pin pull-up (middle vs top curve).
ESD
DIODE
When all three inputs are driven high, I drops to ~10nA.
L
V
= 3.3V
R
T
OH
XD
Thus, to minimize power dissipation, drive these inputs high
when unneeded (e.g., SPB isn’t used in RS-232 mode, so
drive it high).
R
A
V
≥ 2
IH
D
XD
Y
QFN logic input pins that are externally tied high in an
V
≤ 2
OH
GND
GND
application, should use the V supply for the high voltage
L
level.
Active Low Rx Enable (RXEN)
ISL3330
= +3.3V
UART/PROCESSOR
= +2V
In many RS-485 applications, especially half duplex
V
V
CC
CC
configurations, users like to accomplish “echo cancellation”
by disabling the corresponding receiver while its driver is
transmitting data. This function is available on the QFN
package via an active low RXEN pin. The active low function
also simplifies direction control by allowing a single Tx/Rx
direction control line. If the active high RXEN were used,
either two valuable I/O pins would be used for direction
control, or an external inverter is required between DEN and
RXEN. Figure 12 details the advantage of using the RXEN
pin. When using RXEN, ensure that RXEN is tied to GND.
V
L
ESD
V
= 2V
DIODE
R
T
OH
XD
R
A
V
= 1.4V
V
IH
D
XD
Y
≤ 2
OH
GND
GND
RS-485 Slew Rate Limited Data Rates
The ISL333x FAST speed option (SLEW = High) utilizes Tx
output transitions optimized for a 20Mbps data rate. These
fast edges may increase EMI and reflection issues, even
though fast transitions aren’t required at the lower data rates
used by many applications. With the SLEW pin low, both
product types switch to a moderately slew rate limited output
transition targeted for 460kbps (MED) data rates. The
ISL3331 (QFN version), offers an additional slew rate limited
data rate that is optimized for 115kbps (SLOW), and is
selected when SLEW = 0 and SPB = 0 (see Table 3). The
ISL3331
UART/PROCESSOR
FIGURE 11. USING V PIN TO ADJUST LOGIC LEVELS
L
V can be anywhere from V
CC
switching points may not provide enough noise margin when
V < 1.5V. Table 5 indicates typical V and V values for
various V voltages so the user can ascertain whether or not
down to 1.2V, but the input
L
L
IH IL
L
a particular V voltage meets his needs.
L
FN6361.0
May 20, 2008
17
ISL3330, ISL3331
slew limited edges permit longer unterminated networks, or
Evaluation Board
longer stubs off terminated busses, and help minimize EMI
and reflections. Nevertheless, for the best jitter performance
when driving long cables, the faster speed options may be
preferable, even at lower data rates. The faster output
transitions deliver less variability (jitter) when loaded with the
large capacitance associated with long cables. Of course,
faster transitions require more attention to ensuring short
stub lengths and quality terminations, so there are trade-offs
to be made. Assuming a jitter budget of 10%, it is preferable
to go with the slow speed option for data rates of 115kbps or
less to minimize fast edge effects. Likewise, the medium
speed option is a good choice for data rates between
115kbps and 460kbps. For higher data rates, or when the
absolute best jitter is required, use the high speed option.
An evaluation board, part number ISL3331EVAL1Z, is
available to assist in assessing the dual protocol IC’s
performance. The evaluation board contains a QFN
packaged device, but because the same die is used in all
packages, the board is also useful for evaluating the
functionality of the other versions. The board’s design allows
for evaluation of all standard features, plus the QFN specific
features. Refer to the evaluation board application note for
details, and contact your sales representative for ordering
information.
1kΩ
OR NC
+3.3V
ISL3331
+
0.1µF
RXEN *
RA
V
CC
B
R
A
RXEN
Tx/Rx
DEN
DY
Y
D
Z
GND
ACTIVE HIGH RX ENABLE
+3.3V
ISL3331
RXEN
+
0.1µF
V
CC
B
RA
RXEN *
R
A
Tx/Rx
DEN
DY
Y
Z
D
GND
* QFN ONLY
ACTIVE LOW RX ENABLE
FIGURE 12. USING ACTIVE LOW vs ACTIVE HIGH RX
ENABLE
FN6361.0
May 20, 2008
18
ISL3330, ISL3331
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified
CC
L
A
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
30
25
20
15
10
5
V
, +25°C
OL
V
, +25°C
OH
V
, +85°C
OL
V
, +85°C
OH
I
= -0.5mA
OH
= -1mA
I
OH
I
= -6mA
OH
I
= -2mA
1.5
OH
0
1.0
2.0
(V)
2.5
3.0
3.3
0.0
1.0
2.0
3.0 3.3
V
RECEIVER OUTPUT VOLTAGE (V)
L
FIGURE 13. RECEIVER OUTPUT CURRENT vs RECEIVER
OUTPUT VOLTAGE
FIGURE 14. RECEIVER HIGH OUTPUT VOLTAGE vs LOGIC
SUPPLY VOLTAGE (V ) (QFN ONLY)
L
90
80
70
60
50
40
30
20
10
0
2.30
2.25
2.20
2.15
2.10
2.05
2.00
1.95
1.90
R
= 100Ω
DIFF
R
= 54Ω
DIFF
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-40
-25
0
25
50
75 85
TEMPERATURE (°C)
DIFFERENTIAL OUTPUT VOLTAGE (V)
FIGURE 16. RS-485, DRIVER DIFFERENTIAL OUTPUT
VOLTAGE vs TEMPERATURE
FIGURE 15. RS-485, DRIVER OUTPUT CURRENT vs
DIFFERENTIAL OUTPUT VOLTAGE
250
4.5
+25°C
+85°C
RS-232, RXEN, RXEN, ON = X, DEN = V
CC
200
4.0
3.5
3.0
2.5
2.0
1.5
1.0
-40°C
150
100
50
RS-232, RXEN, RXEN = X, ON = V , DEN = GND
CC
Y OR Z = LOW
0
Y OR Z = HIGH
RS-485, HALF DUPLEX, DEN = V , RXEN, RXEN, ON = X
CC
-50
-100
-150
+25°C
RS-485, FULL DUPLEX, DEN = V , RXEN, RXEN, ON = X
+85°C
CC
RS-485, DEN = GND, RXEN, RXEN = X, ON = V
CC
-40°C
-40
0
50
85
-25
25
75
-7 -6
-4
-2
0
2
4
6
8
10
12
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
FIGURE 17. RS-485, DRIVER OUTPUT CURRENT vs SHORT
CIRCUIT VOLTAGE
FIGURE 18. SUPPLY CURRENT vs TEMPERATURE
FN6361.0
May 20, 2008
19
ISL3330, ISL3331
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
50
45
40
35
30
25
20
15
10
5
30
25
20
15
10
5
NO LOAD
= V or GND
DEN, RXEN, DY, DZ/SLEW, ON = GND
NO LOAD
V
IN
L
V
≤ V
V > V
L CC
L
CC
DEN, RXEN, ON = GND
V
= V OR GND
IN
RXEN = V
L
L
SPB = GND
RS-485 I
L
RS-485, SLEW, SPB, RXEN = GND
RS-232/RS-485 I
CC
RS-232, RXEN = GND, SPB = V
L
SPB = V
L
RS-485 I
L
RS-232, SPB, RXEN = V OR
L
SPB = V
L
RS-232 I
RS-485, SLEW, SPB, RXEN = V
L
L
0
0
1.0
1.5
2.0
2.5
(V)
3.0
3.5
4.0
1.0
1.5
2.0
2.5
(V)
3.0
3.5
4.0
V
V
L
L
FIGURE 19. RS-232, V SUPPLY CURRENT vs V VOLTAGE
FIGURE 20. V
CC
and V SHDN SUPPLY CURRENTS vs V
L L
L
L
(QFN ONLY)
VOLTAGE (QFN ONLY)
1640
1630
1620
1610
1600
1590
1580
1570
1560
1550
300
250
200
150
100
50
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
DIFF
L
DIFF
L
|t
- t |
PLHZ PHLY
|t |
- t
PHLZ PLHY
t
DHL
t
DLH
t
DHL
|t
- t
|
DLH DHL
0
-40
-25
0
25
50
75 85
-40
0
50
85
-25
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 22. RS-485, DRIVER SKEW vs TEMPERATURE
FIGURE 21. RS-485, DRIVER PROPAGATION DELAY vs
(SLOW DATA RATE, QFN ONLY)
TEMPERATURE (SLOW DATA RATE, QFN ONLY)
550
545
540
535
530
525
520
515
16
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
L
DIFF
L
DIFF
14
12
10
8
|t
- t |
PLHZ PHLY
t
DHL
|t
- t |
PHLZ PLHY
t
DLH
6
t
DHL
4
|t
- t |
DLH DHL
2
0
-40
-25
0
25
50
75 85
-40
-25
0
25
50
75 85
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 23. RS-485, DRIVER PROPAGATION DELAY vs
FIGURE 24. RS-485, DRIVER SKEW vs TEMPERATURE
TEMPERATURE (MEDIUM DATA RATE)
(MEDIUM DATA RATE)
FN6361.0
May 20, 2008
20
ISL3330, ISL3331
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
24
23
22
21
20
19
18
17
16
15
3.0
2.5
2.0
1.5
1.0
0.5
0
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
L
DIFF
L
DIFF
|t
- t |
DLH DHL
t
DLH
|t
- t
|
PHLZ PLHY
t
DHL
|t
- t
|
PLHZ PHLY
-40
-25
0
25
50
75 85
-40
-25
0
25
50
75 85
TEMPERATURE (°C)
TEMPERATURE (°C)
FIGURE 25. RS-485, DRIVER PROPAGATION DELAY vs
FIGURE 26. RS-485, DRIVER SKEW vs TEMPERATURE
TEMPERATURE (FAST DATA RATE)
(FAST DATA RATE)
R
= 54Ω, C = 100pF
L
DIFF
R
= 54Ω, C = 100pF
L
DIFF
5
0
5
0
D
Y
D
Y
5
0
5
0
R
A
R
A
4
3
2
1
0
4
3
2
1
0
Z
Y
Y
Z
TIME (400ns/DIV)
TIME (400ns/DIV)
FIGURE 28. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (SLOW DATA RATE, QFN ONLY)
FIGURE 27. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (SLOW DATA RATE, QFN ONLY)
R
= 54Ω, C = 100pF
L
R
= 54Ω, C = 100pF
L
DIFF
DIFF
5
0
5
0
D
D
Y
Y
5
0
5
0
R
R
A
A
4
3
2
1
0
4
3
2
1
0
Y
Z
Z
Y
TIME (200ns/DIV)
TIME (200ns/DIV)
FIGURE 29. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (MEDIUM DATA RATE)
FIGURE 30. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (MEDIUM DATA RATE)
FN6361.0
May 20, 2008
21
ISL3330, ISL3331
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
R
= 54Ω, C = 100pF
R
= 54Ω, C = 100pF
L
DIFF
L
DIFF
5
0
5
0
D
D
Y
Y
5
0
5
0
R
A
R
A
4
3
2
1
0
4
3
2
1
0
Z
Y
Y
Z
TIME (10ns/DIV)
TIME (10ns/DIV)
FIGURE 32. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (FAST DATA RATE)
FIGURE 31. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (FAST DATA RATE)
7.5
5.0
7.5
250kbps
V
+
OUT
V
+
5.0
2.5
0
OUT
2.5
0
OUTPUTS STATIC
ALL T LOADED WITH 3kΩ TO GND
400kbps
ALL T
LOADED WITH 3kΩ TO GND
OUTS
OUTS
AND AT V+ OR V-
1 TRANSMITTER AT 250kbps or 400kbps,
OTHER TRANSMITTER AT 30kbps
-2.5
-5.0
-7.5
-2.5
-5.0
400kbps
250kbps
V
-
OUT
V
-
OUT
-7.5
0
1000
2000
3000
4000
5000
-40
0
50
85
-25
25
75
TEMPERATURE (°C)
LOAD CAPACITANCE (pF)
FIGURE 34. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
TEMPERATURE
FIGURE 33. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
LOAD CAPACITANCE
50
C
= 4000pF, 1 CHANNEL SWITCHING
L
40
5
0
5
0
Y OR Z = LOW
DY
30
20
V
SHORTED TO GND
OUT
10
0
Y/A
-5
5
-10
-20
-30
RA
Y OR Z = HIGH
0
2µs/DIV
-40
-25
0
25
50
75 85
TEMPERATURE (°C)
FIGURE 36. RS-232, TRANSMITTER AND RECEIVER
WAVEFORMS AT 250kbps
FIGURE 35. RS-232, TRANSMITTER SHORT CIRCUIT
CURRENT vs TEMPERATURE
FN6361.0
May 20, 2008
22
ISL3330, ISL3331
Typical Performance Curves V = V = 3.3V, T = +25°C; Unless Otherwise Specified (Continued)
CC
L
A
58
57
56
55
54
53
52
51
50
49
V
= ±5
IN
FULL TEMP RANGE
C
= 1000pF, 1 CHANNEL SWITCHING
L
5
0
5
0
DY
SR IN = 15V/µs
Y/A
-5
5
SR IN = 100V/µs
RA
0
0
500
1000
1500
2000
DATA RATE (kbps)
2µs/DIV
FIGURE 37. RS-232, TRANSMITTER AND RECEIVER
WAVEFORMS AT 400kbps
FIGURE 38. RS-232, RECEIVER OUTPUT + DUTY CYCLE vs
DATA RATE
550
7.5
V
≥ ±4V AND DUTY CYCLE BETWEEN 40% AND 60%
OUT
500
450
400
350
300
250
200
150
100
ALL T
LOADED WITH 5kΩ TO GND
+25°C
OUTS
V
+
5.0
2.5
OUT
+85°C
2 TRANSMITTERS AT +25°C
1 TRANSMITTER AT +25°C
1 TRANSMITTER SWITCHING
0
ALL T
OUTS
LOADED WITH 5kΩ TO GND, C = 1000pF
L
-2.5
1 TRANSMITTER AT +85°C
2 TRANSMITTERS AT +85°C
+85°C
+25°C
-5.0
-7.5
V
-
OUT
0
1000
2000
3000
4000
5000
0
100
200
300
400
500
600
LOAD CAPACITANCE (pF)
DATA RATE (kbps)
FIGURE 39. RS-232, TRANSMITTER MAXIMUM DATA RATE vs
LOAD CAPACITANCE
FIGURE 40. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
DATA RATE
Die Characteristics
650
2 TRANSMITTERS SWITCHING
SUBSTRATE AND QFN PAD POTENTIAL
(POWERED UP):
ALL T
LOADED WITH 3kΩ TO GND, C = 1000pF
600
550
500
450
400
350
300
250
OUTS
L
GND
+85°C
TRANSISTOR COUNT:
2490
PROCESS:
+25°C
BiCMOS
-40°C
0
50
200
400
600 650
DATA RATE (kbps)
FIGURE 41. RS-232, TRANSMITTER SKEW vs DATA RATE
FN6361.0
May 20, 2008
23
ISL3330, ISL3331
Package Outline Drawing
L40.6x6
40 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE
Rev 3, 10/06
4X
4.5
6.00
0.50
36X
A
6
B
31
40
PIN #1 INDEX AREA
6
30
1
PIN 1
INDEX AREA
4 . 10 ± 0 . 15
21
10
(4X)
0.15
11
20
0.10 M C A B
TOP VIEW
40X 0 . 4 ± 0 . 1
4
0 . 23 +0 . 07 / -0 . 05
BOTTOM VIEW
SEE DETAIL "X"
C
0.10
C
0 . 90 ± 0 . 1
BASE PLANE
( 5 . 8 TYP )
(
SEATING PLANE
0.08 C
SIDE VIEW
4 . 10 )
( 36X 0 . 5 )
5
C
0 . 2 REF
( 40X 0 . 23 )
0 . 00 MIN.
0 . 05 MAX.
( 40X 0 . 6 )
DETAIL "X"
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3.
Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension b applies to the metallized terminal and is measured
between 0.15mm and 0.30mm from the terminal tip.
Tiebar shown (if present) is a non-functional feature.
5.
6.
The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 indentifier may be
either a mold or mark feature.
FN6361.0
May 20, 2008
24
ISL3330, ISL3331
Shrink Small Outline Plastic Packages (SSOP)
N
M20.209 (JEDEC MO-150-AE ISSUE B)
INDEX
AREA
M
M
B
0.25(0.010)
20 LEAD SHRINK SMALL OUTLINE PLASTIC PACKAGE
H
E
INCHES
MIN
MILLIMETERS
GAUGE
PLANE
-B-
SYMBOL
MAX
0.078
0.008’
0.070’
0.015
0.008
0.289
0.212
MIN
1.73
0.05
1.68
0.25
0.09
7.07
5.20’
MAX
1.99
0.21
1.78
0.38
0.20’
7.33
5.38
NOTES
A
A1
A2
B
0.068
0.002
0.066
0.010’
0.004
0.278
0.205
1
2
3
L
0.25
0.010
SEATING PLANE
A
9
-A-
D
C
D
E
3
4
-C-
α
A2
e
A1
e
0.026 BSC
0.65 BSC
C
B
0.10(0.004)
H
L
0.301
0.025
0.311
0.037
7.65
0.63
7.90’
0.95
M
M
S
B
0.25(0.010)
C
A
6
7
N
α
20
20
0 deg.
8 deg.
0 deg.
8 deg.
NOTES:
Rev. 3 11/02
1. Symbols are defined in the “MO Series Symbol List” in Section
2.2 of Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.20mm (0.0078 inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. In-
terlead flash and protrusions shall not exceed 0.20mm (0.0078
inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable
dambar protrusion shall be 0.13mm (0.005 inch) total in excess
of “B” dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch dimen-
sions are not necessarily exact.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN6361.0
May 20, 2008
25
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