ICL3245EIAZ-T [RENESAS]
±15kV ESD Protected, +3V to +5.5V, 1mA, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown; SSOP28; Temp Range: See Datasheet;
| 型号： | ICL3245EIAZ-T |
| 厂家： | 
RENESAS TECHNOLOGY CORP |
| 描述： | ±15kV ESD Protected, +3V to +5.5V, 1mA, 1Mbps, RS-232 Transceivers with Enhanced Automatic Powerdown; SSOP28; Temp Range: See Datasheet 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总28页 (文件大小：418K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Datasheet
ICL3225E, ICL3227E, ICL3245E
±15kV ESD Protected, +3V to +5.5V, 1µA, 1Mbps, RS-232 Transceivers with
Enhanced Automatic Powerdown
The ICL3225E, ICL3227E, and ICL3245E devices are
3.0V to 5.5V powered RS-232 transmitters/receivers
that meet ElA/TIA-232 and V.28/V.24 specifications,
Features
• Pb-free (RoHS compliant)
• ESD protection for RS-232 I/O pins to ±15kV
(IEC61000)
even at V = 3.0V. They provide ±15kV ESD
CC
protection (IEC61000-4-2 Air Gap and Human Body
Model) on transmitter outputs and receiver inputs
(RS-232 pins). Targeted applications are PDAs,
Palmtops, and notebook and laptop computers where
the low operational power consumption and even
lower standby power consumption are critical.
Efficient on-chip charge pumps coupled with manual
and enhanced automatic powerdown functions,
reduce the standby supply current to a 1µA trickle.
Small footprint packaging and the use of small, low
value capacitors ensure board space savings. Data
rates greater than 1Mbps are ensured at worst case
load conditions. This family is fully compatible with
3.3V only systems, mixed 3.3V and 5.0V systems,
and 5.0V only systems.
• Manual and enhanced automatic powerdown
features
• Drop in replacements for MAX3225E, MAX3227E,
MAX3245E
• RS-232 compatible with V = 2.7V
CC
• Meets EIA/TIA-232 and V.28/V.24 specifications at
3V
• Latch-up free
• On-chip voltage converters require only four
external 0.1µF capacitors
• Ensured mouse driveability (ICL3245E)
• “Ready to Transmit” indicator output
(ICL3225E/ICL3227E)
The ICL3245E is a 3-driver, 5-receiver device that
provides a complete serial port suitable for laptop or
notebook computers. It also includes a noninverting
always-active receiver for “wake-up” capability.
• Receiver hysteresis for improved noise immunity
• Ensured minimum data rate: 1Mbps
The ICL3225E, ICL3227E, and ICL3245E feature an
enhanced automatic powerdown function that powers
down the on-chip power supply and driver circuits.
Powerdown occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30s.
These devices power back up automatically
whenever they sense a transition on any transmitter
or receiver input.
• Low skew at transmitter/receiver input trip
points: 10ns
• Ensured minimum slew rate: 24V/µs
• Wide power supply range: single +3V to +5.5V
• Low supply current in powerdown state: 1µA
Applications
Table 1 summarizes the features of the device
represented by this datasheet and AN9863
summarizes the features of each device in the
ICL32xxE 3V family.
• Any system requiring RS-232 communication ports
○ Battery powered, hand-held, and portable
equipment
○ Laptop computers, notebooks, palmtops
○ Modems, printers, and other peripherals
○ Digital cameras
Related Literature
For a full list of related documents, visit our website:
• ICL3225E, ICL3227E, and ICL3245E device pages
○ Cellular/mobile phones
FN4900 Rev.13.00
May.2.19
Page 1 of 28
ICL3225E, ICL3227E, ICL3245E
Contents
1.
Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1
1.2
1.3
1.4
Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.
Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
2.2
2.3
2.4
Absolute Maximum Ratings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.
4.
Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1
Charge Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.1
Charge Pump Abs Max Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Transmitters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Receivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Powerdown Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Software Controlled (Manual) Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
INVALID Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Enhanced Automatic Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Emulating Standard Automatic Powerdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Hybrid Automatic Powerdown Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
READY Output (ICL3225E and ICL3227E Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Power Supply Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Operation Down to 2.7V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Transmitter Outputs when Exiting Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Mouse Driveability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
High Data Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Interconnection with 3V and 5V Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.2
4.3
4.4
4.4.1
4.4.2
4.4.3
4.4.4
4.4.5
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
5.
±15kV ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1
5.2
5.3
5.4
Human Body Model (HBM) Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
IEC61000-4-2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Air-Gap Discharge Test Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Contact Discharge Test Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.
7.
8.
Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
FN4900 Rev.13.00
May.2.19
Page 2 of 28
ICL3225E, ICL3227E, ICL3245E
1. Overview
1. Overview
1.1
Typical Operating Circuits
+3.3V
+
0.1µF
19
2
C
0.1µF
C1+
V
3
1
CC
C
0.1µF
+
3
+
V+
V-
4
C1-
5
C
0.1µF
2
C2+
+
7
C
4
0.1µF
6
C2-
+
T
T
1
2
13
17
8
T1
T2
T1
T2
IN
OUT
OUT
12
15
IN
TTL/CMOS
Logic Levels
RS-232
Levels
16
R1
R2
R1
R2
OUT
IN
IN
5kΩ
5kΩ
R
1
10
9
OUT
R
2
1
20
11
READY
V
FORCEOFF
INVALID
CC
14
To Power
Control Logic
FORCEON
GND
18
Figure 1. ICL3225E
+3.3V
+
15
0.1µF
2
+
4
C
1
0.1µF
3
C1+
V
CC
C
3
0.1µF
+
V+
V-
C1-
5
C
2
C2+
+
7
0.1µF
C
4
0.1µF
6
C2-
+
T
1
11
13
T1
T1
OUT
IN
TTL/CMOS
Logic Levels
RS-232
Levels
9
1
8
R1
R1
IN
OUT
5kΩ
R
1
READY
16
10
V
CC
FORCEOFF
INVALID
12
To Power
Control Logic
FORCEON
GND
14
Figure 2. ICL3227E
FN4900 Rev.13.00
May.2.19
Page 3 of 28
ICL3225E, ICL3227E, ICL3245E
1. Overview
+3.3V
+
26
0.1µF
28
27
C
0.1µF
C1+
1
V
CC
C
0.1µF
3
+
+
+
V+
V-
24
1
C1-
C
0.1µF
2
C2+
3
9
C
4
2
0.1µF
C2-
+
T
T
T
1
2
3
14
T1
T1
IN
OUT
13
12
20
10
11
RS-232
Levels
T2
T3
T2
T3
IN
IN
OUT
OUT
R2
OUTB
TTL/CMOS
Logic Levels
19
18
4
5
R1
R1
R2
OUT
OUT
IN
R
1
2
5kΩ
5kΩ
R2
IN
R
17
16
6
7
RS-232
Levels
R3
R4
R3
R4
OUT
OUT
IN
R
R
5kΩ
3
4
IN
5kΩ
5kΩ
15
23
8
R5
R5
OUT
IN
R
5
FORCEON
22
21
V
CC
FORCEOFF
GND
25
To Power
Control Logic
INVALID
Figure 3. ICL3245E
FN4900 Rev.13.00
May.2.19
Page 4 of 28
ICL3225E, ICL3227E, ICL3245E
1. Overview
1.2
Ordering Information
Part Number
(Notes 2, 3)
Tape and Reel
(Units) (Note 1)
Package
(RoHS Compliant)
Part Marking
Temp Range (°C)
0 to +70
Pkg. Dwg. #
M20.209
M20.209
M20.209
M20.209
M16.209
M16.209
M16.209
M16.209
M28.209
M28.209
M28.209
M28.209
ICL3225ECAZ
ICL3225ECAZ-T
ICL3225EIAZ
ICL3225ECAZ
ICL3225ECAZ
ICL3225EIAZ
ICL3225EIAZ
3227ECAZ
-
1k
-
20 Ld SSOP
20 Ld SSOP
20 Ld SSOP
20 Ld SSOP
16 Ld SSOP
16 Ld SSOP
16 Ld SSOP
16 Ld SSOP
28 Ld SSOP
28 Ld SSOP
28 Ld SSOP
28 Ld SSOP
0 to +70
-40 to +85
-40 to +85
0 to +70
ICL3225EIAZ-T
ICL3227ECAZA
ICL3227ECAZA-T
ICL3227EIAZA
ICL3227EIAZA-T
ICL3245ECAZ
ICL3245ECAZ-T
ICL3245EIAZ
1k
-
3227ECAZ
0 to +70
1k
-
3227EIAZ
-40 to +85
-40 to +85
0 to +70
3227EIAZ
1k
-
ICL3245ECAZ
ICL3245ECAZ
ICL3245EIAZ
ICL3245EIAZ
0 to +70
1k
-
-40 to +85
-40 to +85
ICL3245EIAZ-T
Notes:
1k
1. See TB347 for details about reel specifications.
2. These 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).
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.
3. For Moisture Sensitivity Level (MSL), see the ICL3225E, ICL3227E, and ICL3245E device pages. For more information about MSL, see
TB363.
Table 1. Summary of Features
Enhanced
Number of
Monitor Rx.
Automatic
Powerdown
Function?
Number Number
Data Rate
(kbps)
Rx. Enable
Function?
Ready
Output?
Manual
Powerdown?
Part Number
ICL3225E
ICL3227E
ICL3245E
of Tx.
of Rx.
(ROUTB
)
2
1
3
2
1
5
0
0
1
1000
1000
1000
No
No
No
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
1.3
Pin Configurations
ICL3225E (SSOP)
Top View
ICL3227E (SSOP)
Top View
READY
C1+
V+
1
2
20 FORCEOFF
19
READY
1
2
3
4
5
6
7
8
16 FORCEOFF
15
V
C1+
V+
V
CC
CC
3
18 GND
17 T1
14 GND
13 T1
C1-
4
C1-
C2+
C2-
V-
OUT
OUT
C2+
C2-
5
16 R1
15 R1
12 FORCEON
IN
6
11 T1
IN
OUT
V-
7
14 FORCEON
10 INVALID
T2
8
13 T1
IN
R1
IN
9 R1
OUT
OUT
R2
IN
9
12
T2
IN
10
11 INVALID
R2
OUT
FN4900 Rev.13.00
May.2.19
Page 5 of 28
ICL3225E, ICL3227E, ICL3245E
1. Overview
ICL3245E (SSOP)
Top View
C2+
C2-
V-
1
2
28 C1+
27 V+
3
26 V
CC
25 GND
R1
R2
R3
R4
R5
4
IN
IN
IN
IN
IN
5
24 C1-
6
23 FORCEON
22 FORCEOFF
21 INVALID
7
8
T1
T2
T3
9
20
R2
OUT
OUT
OUT
OUTB
OUT
OUT
OUT
OUT
OUT
10
11
19 R1
18 R2
17 R3
16 R4
15 R5
T3 12
IN
T2 13
IN
T1 14
IN
1.4
Pin Descriptions
Pin
VCC
V+
Function
System power supply input (3.0V to 5.5V).
Internally generated positive transmitter supply (+5.5V).
Internally generated negative transmitter supply (-5.5V).
Ground connection.
V-
GND
C1+
C1-
C2+
C2-
TxIN
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage doubler) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
External capacitor (voltage inverter) is connected to this lead.
TTL/CMOS compatible transmitter Inputs.
TxOUT
RxIN
±15kV ESD protected, RS-232 level (nominally ±5.5V) transmitter outputs.
±15kV ESD protected, RS-232 compatible receiver inputs.
RxOUT
R2OUTB
INVALID
READY
TTL/CMOS level receiver outputs.
TTL/CMOS level, noninverting, always enabled receiver outputs.
Active low output that indicates if no valid RS-232 levels are present on any receiver input.
Active high output that indicates when the ICL32xxE is ready to transmit (V- ≤ -4V).
FORCEOFF Active low to shut down transmitters and on-chip power supply, which overrides any automatic circuitry and FORCEON (see
Table 5 on page 15).
FORCEON Active high input to override automatic powerdown circuitry and keeps transmitters active. (FORCEOFF must be high).
FN4900 Rev.13.00
May.2.19
Page 6 of 28
ICL3225E, ICL3227E, ICL3245E
2. Specifications
2. Specifications
2.1
Absolute Maximum Ratings
Parameter
Minimum
-0.3
Maximum
Unit
V
VCC to GND
V+ to GND
V- to GND
6
-0.3
7
V
+0.3
-7
14
V
V+ to V-
V
Input Voltages
T
IN, FORCEOFF, FORCEON
-0.3
-0.3
6
V
V
RIN
±25
Output Voltages
TOUT
±13.2
V
V
R
OUT, INVALID, READY
VCC +0.3
Short-Circuit Duration
TOUT
Continuous
ESD Rating
(See “ESD Performance” on page 9)
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely
impact product reliability and result in failures not covered by warranty.
2.2
Thermal Information
Thermal Resistance (Typical, Note 4)
θJA (°C/W)
145
16 Ld SSOP Package
20 Ld SSOP Package
28 Ld SSOP Package
Notes:
135
100
4. θJA is measured with the component mounted on a low-effective thermal conductivity test board in free air. See TB379 for details.
Parameter
Maximum Junction Temperature (Plastic Package)
Maximum Storage Temperature Range
Pb-Free Reflow Profile
Minimum
Maximum
+150
Unit
°C
-65
+150
°C
see TB493
2.3
Recommended Operating Conditions
Parameter
Minimum
Maximum
Unit
Temperature Range
ICL32xxEC
0
+70
+85
°C
°C
ICL32xxEI
-40
FN4900 Rev.13.00
May.2.19
Page 7 of 28
ICL3225E, ICL3227E, ICL3245E
2. Specifications
2.4
Electrical Specifications
Test conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at TA = +25°C
Temp
Parameter
Test Conditions
(°C)
Min
Typ
Max Unit
DC Characteristics
Supply Current, Automatic
Powerdown
All RIN open, FORCEON = GND, FORCEOFF = VCC
+25
-
1.0
10
µA
Supply Current, Powerdown
FORCEOFF = GND
+25
+25
-
-
1.0
0.3
10
µA
Supply Current,
All outputs unloaded, FORCEON = FORCEOFF = VCC
1.0
mA
Automatic Powerdown Disabled
Logic and Transmitter Inputs and Receiver Outputs
Input Logic Threshold Low
Input Logic Threshold High
T
T
IN, FORCEON, FORCEOFF
IN, FORCEON,
Full
Full
Full
Full
Full
Full
-
2.0
2.4
-
-
0.8
V
V
V
VCC = 3.3V
CC = 5.0V
-
-
-
FORCEOFF
V
-
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
Receiver Inputs
T
IN, FORCEON, FORCEOFF
±0.01
±0.05
-
±1.00 µA
FORCEOFF = GND, ICL3245E only
-
±10
0.4
-
µA
V
I
I
OUT = 1.6mA
OUT = -1.0mA
-
Full VCC - 0.6 VCC - 0.1
V
Input Voltage Range
Input Threshold Low
Full
+25
+25
+25
+25
+25
+25
-25
0.6
0.8
-
-
25
-
V
V
V
CC = 3.3V
1.2
1.5
1.5
1.8
0.5
5
VCC = 5.0V
-
V
Input Threshold High
V
V
CC = 3.3V
CC = 5.0V
2.4
2.4
-
V
-
V
Input Hysteresis
-
V
Input Resistance
3
7
kΩ
Transmitter Outputs
Output Voltage Swing
Output Resistance
All transmitter outputs loaded with 3kΩ to Ground
Full
Full
Full
±5.0
±5.4
10M
±35
-
-
-
V
V
CC = V+ = V- = 0V, transmitter output = ±2V
300
Ω
Output Short-Circuit Current
Output Leakage Current
-
-
±60 mA
V
OUT = ±12V, VCC = 0V or 3V to 5.5V, automatic powerdown Full
±25
µA
or FORCEOFF = GND
Mouse Driveability
Transmitter Output Voltage
(See Figure 20 on page 20)
T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3kΩ to
GND, T1OUT and T2OUT loaded with 2.5mA each
Full
±5
-
-
V
Enhanced Automatic Powerdown (FORCEON = GND, FORCEOFF = VCC)
Receiver Input Thresholds to
INVALID High
See Figure 15 on page 17
Full
Full
Full
-2.7
-0.3
-
-
-
2.7
0.3
0.4
-
V
V
Receiver Input Thresholds to
INVALID Low
See Figure 15 on page 17
INVALID, READY Output Voltage IOUT = 1.6mA
Low
-
V
INVALID, READY Output Voltage IOUT = -1.0mA
High
Full VCC - 0.6
-
V
Receiver Positive or Negative
+25
-
1
-
µs
Threshold to INVALID High Delay
(tINVH
)
FN4900 Rev.13.00
May.2.19
Page 8 of 28
ICL3225E, ICL3227E, ICL3245E
2. Specifications
Test conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at TA = +25°C (Continued)
Temp
Parameter
Test Conditions
(°C)
Min
Typ
Max Unit
Receiver Positive or Negative
+25
-
30
-
µs
Threshold to INVALID Low Delay
(tINVL
)
Receiver or Transmitter Edge to
Transmitters Enabled Delay (tWU
(Note 5)
(Note 5)
25
-
100
30
-
µs
)
Receiver or Transmitter Edge to
Transmitters Disabled Delay
Full
15
60
sec
(tAUTOPWDN
)
Timing Characteristics
Maximum Data Rate
RL = 3kΩ, one transmitter
switching
CL = 1000pF
Full
Full
Full
250
1000
1000
-
-
-
-
-
-
kbps
kbps
kbps
V
CC = 3V to 4.5V, CL = 250pF
V
CC = 4.5V to 5.5V,
CL = 1000pF
tPHL
Receiver Propagation Delay
Receiver input to receiver
output, CL = 150pF
+25
+25
+25
+25
+25
+25
+25
-
-
0.15
0.15
200
200
25
-
-
-
-
-
-
µs
µs
ns
ns
ns
ns
tPLH
Receiver Output Enable Time
Receiver Output Disable Time
Transmitter Skew
Normal operation (ICL3245E only)
Normal operation (ICL3245E only)
-
-
t
PHL - tPLH (Note 6)
tPHL - tPLH (Note 6)
CC = 3.3V, RL = 3kΩ to 7kΩ, measured from 3V to -3V or
-
Receiver Skew
-
50
Transition Region Slew Rate
V
24
-
150 V/µs
-3V to 3V, CL = 150pF to 1000pF
ESD Performance
RS-232 Pins (TOUT, RIN
)
Human body model
+25
-
-
-
-
-
-
-
±15
±8
-
-
-
-
-
-
-
kV
kV
kV
kV
kV
kV
kV
IEC61000-4-2 contact discharge
IEC61000-4-2 air gap discharge
+25
+25
+25
±15
±2
All Other Pins
ICL3245E
Human body model (HBM)
Charged Device Model (CDM) +25
±1.5
±4
ICL3225E, ICL3227E
Human body model (HBM)
+25
Charged Device Model (CDM) +25
±2
Notes:
5. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
6. Skews are measured at the receiver input switching points (1.4V).
FN4900 Rev.13.00
May.2.19
Page 9 of 28
ICL3225E, ICL3227E, ICL3245E
3. Typical Performance Curves
3. Typical Performance Curves
VCC = 3.3V, TA = +25°C
6
110
90
70
50
30
V
+
OUT
4
2
+SLEW
1 Transmitter at 1Mbps
Other Transmitters at 30kbps
0
-SLEW
-2
-4
V
-
OUT
10
0
-6
0
1000
2000
3000
4000
5000
0
1000
2000
3000
4000
5000
Load Capacitance (pF)
Load Capacitance (pF)
Figure 4. Transmitter Output Voltage vs Load
Capacitance
Figure 5. Slew Rate vs Load Capacitance
90
90
80
70
60
50
ICL3225E
80
ICL3227E
1Mbps
1Mbps
70
60
50
250kbps
120kbps
40
40
30
250kbps
30
120kbps
20
10
20
10
4000
5000
2000
3000
1000
0
0
1000
2000
3000
4000
5000
Load Capacitance (pF)
Load Capacitance (pF)
Figure 6. Supply Current vs Load Capacitance When
Transmitting Data
Figure 7. Supply Current vs Load Capacitance When
Transmitting Data
FN4900 Rev.13.00
May.2.19
Page 10 of 28
ICL3225E, ICL3227E, ICL3245E
3. Typical Performance Curves
VCC = 3.3V, TA = +25°C (Continued)
90
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
No Load
All Outputs Static
1Mbps
ICL3245E
80
70
60
50
250kbps
40
30
120kbps
20
10
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
0
1000
2000
3000
4000
5000
Supply Voltage (V)
Load Capacitance (pF)
Figure 9. Supply Current vs Supply Voltage
Figure 8. Supply Current vs Load Capacitance When
Transmitting Data
FN4900 Rev.13.00
May.2.19
Page 11 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
4. Application Information
The ICL3225E, ICL3227E, and ICL3245E (ISL32xxE) operate from a single +3V to +5.5V supply, ensure a 1Mbps
minimum data rate, require only four small external 0.1µF capacitors, feature low power consumption, and meet
all ElA RS-232C and V.28 specifications.
4.1
Charge Pump
The ICL32xxE use regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate
±5.5V transmitter supplies from a V supply as low as 3.0V, which allows these devices to maintain RS-232
CC
compliant output levels over the ±10% tolerance range of 3.3V powered systems. The efficient on-chip power
supplies require only four small, external 0.1µF capacitors for the voltage doubler and inverter functions at
V
= 3.3V. See the Capacitor Selection, and Table 6 on page 19 for capacitor recommendations for other
CC
operating conditions. The charge pumps operate discontinuously (turning off when the V+ and V- supplies are
pumped up to the nominal values), resulting in significant power savings.
4.1.1 Charge Pump Abs Max Ratings
These 3V to 5V RS-232 transceivers have been fully characterized for 3.0V to 3.6V operation and for critical
points at 4.5V to 5.5V operation. Furthermore, load conditions were favorable using static logic states only.
The specified maximum values for V+ and V- are +7V and -7V, respectively. These limits apply for V values set
CC
to 3.0V and 3.6V (see Table 2). For V values set to 4.5V and 5.5V, the maximum values for V+ and V- can
CC
approach +9V and -7V, respectively (Table 3 on page 13). The breakdown characteristics for V+ and V- were
measured with ±13V.
Table 2. V+ and V- Values for V = 3.0V to 3.6V
CC
V+ (V)
V- (V)
T1IN
C1 (μF)
C2, C3, C4 (μF)
Load
(Logic State)
VCC = 3.0V
5.80
5.80
5.80
5.88
5.76
6.00
5.68
5.68
5.68
5.76
5.68
5.84
5.88
5.88
5.80
5.88
5.88
5.92
VCC = 3.6V
6.56
6.56
6.56
6.60
6.36
6.64
6.00
6.00
6.00
6.08
6.04
6.16
6.24
6.28
6.20
6.44
6.04
6.40
VCC = 3.0V
-5.60
-5.60
-5.60
-5.56
-5.56
-5.64
-5.60
-5.60
-5.60
-5.64
-5.60
-5.64
-5.60
-5.60
-5.60
-5.64
-5.64
-5.64
VCC = 3.6V
-5.88
-5.88
-5.88
-5.92
-5.76
-5.96
-5.60
-5.60
-5.60
-5.64
-5.60
-5.72
-5.60
-5.64
-5.60
-5.72
-5.64
-5.64
0.1
0.1
Open
H
L
2.4kbps
3kΩ // 1000pF
Open
H
L
2.4kbps
0.047
0.33
H
L
2.4kbps
3kΩ // 1000pF
Open
H
L
2.4kbps
1
1
H
L
2.4kbps
H
3kΩ // 1000pF
L
2.4kbps
FN4900 Rev.13.00
May.2.19
Page 12 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
Table 3. V+ and V- Values for V = 4.5V to 5.5V
CC
V+ (V)
VCC = 4.5V
V- (V)
T1IN
(Logic State)
C1 (μF)
C2, C3, C4 (μF)
Load
VCC = 5.5V
8.48
8.48
8.48
8.88
8.00
8.84
6.88
6.88
6.88
7.28
6.60
7.16
7.60
7.60
7.56
8.16
6.84
7.76
VCC = 4.5V
-6.16
-6.16
-6.17
-6.36
-5.76
-6.40
-5.80
-5.84
-5.80
-5.92
-5.52
-5.92
-5.76
-5.76
-5.72
-5.80
-5.64
-5.80
VCC = 5.5V
-6.40
-6.44
-6.44
-6.72
-5.76
-6.64
-5.88
-5.88
-5.88
-6.04
-5.52
-5.96
-5.76
-5.76
-5.76
-5.92
-6.84
-5.80
0.1
0.1
Open
H
7.44
7.44
7.44
7.76
7.08
7.76
6.44
6.48
6.44
6.64
6.24
6.72
6.84
6.88
6.92
7.28
6.44
7.08
L
2.4kbps
3kΩ // 1000pF
Open
H
L
2.4kbps
0.047
0.33
H
L
2.4kbps
3kΩ // 1000pF
Open
H
L
2.4kbps
1
1
H
L
2.4kbps
H
3kΩ // 1000pF
L
2.4kbps
The resulting new maximum voltages at V+ and V- are listed in Table 4.
Table 4. New Measured Withstanding Voltages
V+, V- to Ground
V+ to V-
±13V
20V
4.2
Transmitters
The transmitters are proprietary, low dropout, inverting drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. The transmitters are coupled with the on-chip ±5.5V supplies to deliver true RS-232 levels over a
wide range of single supply system voltages.
Transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode
(see Table 5 on page 15). The outputs can be driven to ±12V when disabled.
All devices ensure a 1Mbps data rate for full load conditions (3kΩ and 250pF), V ≥ 3.0V, with one transmitter
CC
operating at full speed. Under more typical conditions of V ≥ 3.3V, R = 3kΩ, and C = 250pF, one transmitter
CC
L
L
easily operates at 1.4Mbps. Transmitter skew is extremely low on these devices, and is specified at the receiver
input trip points (1.4V), rather than the arbitrary 0V crossing point typical of other RS-232 families.
Transmitter inputs float if they remain unconnected and can increase I . Connect unused inputs to GND for best
CC
performance.
FN4900 Rev.13.00
May.2.19
Page 13 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
4.3
Receivers
All the ICL32xxE devices contain standard inverting receivers, but only the ICL3245E receivers can tri-state using
the FORCEOFF control line. The ICL3245E includes a noninverting (monitor) receiver (denoted by the R
OUTB
label) that is always active regardless of the state of any control lines. Both receiver types convert RS-232 signals
to CMOS output levels and accept inputs up to ±25V while presenting the required 3kΩ to 7kΩ input impedance
(see Figure 10) even if the power is off (V = 0V). The receivers’ Schmitt trigger input stage uses hysteresis to
CC
increase noise immunity and decrease errors due to slow input signal transitions.
V
CC
R
R
XOUT
XIN
GND ≤ V
≤ V
CC
-25V ≤ V
≤ +25V
5kΩ
ROUT
RIN
GND
Figure 10. Inverting Receiver Connections
The ICL3245E inverting receivers disable during forced (manual) powerdown, but not during automatic
powerdown (see Table 5). Conversely, the monitor receiver remains active even during manual powerdown,
which makes it extremely useful for Ring Indicator monitoring. Standard receivers driving powered down
peripherals must be disabled to prevent current flow through the peripheral’s protection diodes (see Figures 11
and 12). When powered down, they cannot be used for wake-up functions, but the corresponding monitor receiver
can be dedicated to this task as shown in Figure 12.
V
CC
V
CC
Transition
Detector
V
CC
To
Wake-Up
Logic
ICL3245E
Current
Flow
V
CC
V
CC
V
= V
CC
OUT
R2
OUTB
Rx
R
T
V
= HI-Z
Powered
Down
UART
X
OUT
R2
OUT
Powered
Down
UART
R2
IN
Tx
T1
X
IN
Old
RS-232 Chip
SHDN = GND
GND
T1
OUT
FORCEOFF = GND
Figure 11. Power Drain Through Powered Down Peripheral
Figure 12. Disabled Receivers Prevent Power Drain
FN4900 Rev.13.00
May.2.19
Page 14 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
4.4
Powerdown Functionality
The 3V ICL32xxE devices require a nominal supply current of 0.3mA during normal operation (not in powerdown
mode). This current is considerably less than the 5mA to 11mA current required of 5V RS-232 devices. The
already low current requirement drops significantly when the device enters powerdown mode. In powerdown,
supply current drops to 1µA, because the on-chip charge pump turns off (V+ collapses to V , V- collapses to
CC
GND), and the transmitter outputs tri-state. Inverting receiver outputs may or may not disable in powerdown; see
Table 5 for details. This micro-power mode makes these devices ideal for battery powered and portable
applications.
Table 5. Powerdown Logic Truth Table
RCVR or
XMTR
RS-232
Level
EDGE
ROUTB
Outputs
(Note 7)
Present at
Receiver
Input?
Within 30 FORCEOFF FORCEON
Sec?
Transmitter
Outputs
Receiver
Outputs
INVALID
Output
Input
Input
Mode of Operation
ICL3225E, ICL3227E
No
No
Yes
Yes
No
No
X
H
H
H
H
H
H
L
H
H
L
Active
Active
Active
Active
High-Z
High-Z
High-Z
High-Z
Active
Active
Active
Active
Active
Active
Active
Active
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
N.A.
No
Yes
No
L
H
L
Normal Operation (Enhanced
Auto Powerdown Disabled)
Normal Operation (Enhanced
Auto Powerdown Enabled)
L
Yes
No
H
L
L
Powerdown Due to Enhanced
Auto Powerdown Logic
L
Yes
No
H
L
X
X
Manual Powerdown
X
L
Yes
H
ICL322XE - INVALID Driving FORCEON and FORCEOFF (Emulates Automatic Powerdown)
X
Note 8
Note 8
Note 8
Note 8
Active
Active
Active
N.A.
N.A.
Yes
No
H
L
Normal Operation
X
ICL3245E
No
High-Z
Forced Auto Powerdown
H
H
H
H
H
H
L
H
H
L
Active
Active
Active
Active
High-Z
High-Z
High-Z
High-Z
Active
Active
Active
Active
Active
Active
High-Z
High-Z
Active
Active
Active
Active
Active
Active
Active
Active
No
Yes
No
L
H
L
Normal Operation (Enhanced
Auto Powerdown Disabled)
No
Yes
Yes
No
Normal Operation (Enhanced
Auto Powerdown Enabled)
L
Yes
No
H
L
L
Powerdown Due to Enhanced
Auto Powerdown Logic
No
L
Yes
No
H
L
X
X
X
Manual Powerdown
X
L
Yes
H
ICL3245E - INVALID Driving FORCEON and FORCEOFF (Emulates Automatic Powerdown)
X
X
Note 8
Note 8
Note 8
Note 8
Active
Active
Active
Active
Yes
No
H
L
Normal Operation
High-Z
High-Z
Forced Auto Powerdown
Notes:
7. Applies only to the ICL3245E.
8. Input is connected to INVALID Output.
FN4900 Rev.13.00
May.2.19
Page 15 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
4.4.1 Software Controlled (Manual) Powerdown
The ICL32xxE devices allow you to force the IC into the low power, standby state, and use a two pin approach
where the FORCEON and FORCEOFF inputs determine the IC’s mode. For always enabled operation,
FORCEON and FORCEOFF are both strapped high. Under logic or software control, only the FORCEOFF input
needs to be driven to switch between active and power-down modes. The FORCEON state is not critical because
FORCEOFF overrides FORCEON. However, if strictly manual control over power-down is needed, you must strap
FORCEON high to disable the automatic powerdown circuitry. The ICL3245E inverting (standard) receiver
outputs also disable when the device is in powerdown, and eliminate the possible current path through a
shutdown peripheral’s input protection diode (see Figures 11 and 12).
Connecting FORCEOFF and FORCEON together disables the enhanced automatic powerdown feature, which
enables them to function as a manual SHUTDOWN input (see Figure 13).
With any of the above control schemes, the time required to exit powerdown and resume transmission is only
100µs.
FORCEOFF
Power
FORCEON
Management
Logic
INVALID
ICL32xxE
I/O
UART
CPU
Figure 13. Connections for Manual Powerdown When No Valid Receiver Signals are Present
When using both manual and enhanced automatic powerdown (FORCEON = 0), the ICL32xxE devices do not
power up from manual powerdown until both FORCEOFF and FORCEON are driven high, or until a transition
occurs on a receiver or transmitter input. Figure 14 shows a circuit for ensuring that the ICL32xxE powers up as
soon as FORCEOFF switches high. The rising edge of the master powerdown signal forces the device to power
up, and the ICL32xxE returns to enhanced automatic powerdown mode an RC time constant after this rising
edge. The time constant is not critical, because the ICL32xxE remains powered up for 30 seconds after the
FORCEON falling edge, even if there are no signal transitions. The delay gives slow-to-wake systems (such as a
mouse) plenty of time to start transmitting, and as long as it starts transmitting within 30 seconds both systems
remain enabled.
Master Powerdown Line
0.1µF
Power
Management
Unit
1MΩ
FORCEOFF
FORCEON
ICL32xxE
Figure 14. Circuit to Ensure Immediate Power Up When Exiting Forced Powerdown
4.4.2 INVALID Output
Table 5 on page 15 on the INVALID output always indicates whether 30µs have elapsed with invalid RS-232
signals (see Figures 15 and 17) persisting on all of the receiver inputs, and provides you a way to determine when
FN4900 Rev.13.00
May.2.19
Page 16 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
the interface block should power down. Invalid receiver levels occur whenever the driving peripheral’s outputs are
shut off (powered down) or when the RS-232 interface cable is disconnected. If an interface cable is disconnected
and all the receiver inputs are floating (but pulled to GND by the internal receiver pull down resistors), the
INVALID logic detects the invalid levels and drives the output low. The power management logic then uses this
indicator to power down the interface block. Reconnecting the cable restores valid levels at the receiver inputs,
INVALID switches high, and the power management logic wakes up the interface block. INVALID can also be
used to indicate the DTR or RING INDICATOR signal, as long as the other receiver inputs are floating, or driven to
GND (as in the case of a powered down driver).
Valid RS-232 Level - INVALID = 1
2.7V
Indeterminate
0.3V
Invalid Level - INVALID = 0
-0.3V
Indeterminate
-2.7V
Valid RS-232 Level - INVALID = 1
Figure 15. Definition of Valid RS-232 Receiver Levels
4.4.3 Enhanced Automatic Powerdown
Even greater power savings are available by using the ICL32xxE's enhanced automatic powerdown function.
When the enhanced powerdown logic determines that no transitions have occurred on any of the transmitter or
receiver inputs for 30 seconds, the charge pump and transmitters powerdown, and reduces supply current to 1µA.
The ICL32xxE devices automatically power back up whenever they detect a transition on one of these inputs. The
automatic powerdown feature provides additional system power savings without changes to the existing operating
system.
Enhanced automatic powerdown operates when the FORCEON input is low and the FORCEOFF input is high.
Tying FORCEON high disables automatic powerdown, but manual powerdown is always available using the
overriding FORCEOFF input. Table 5 on page 15 summarizes the enhanced automatic powerdown functionality.
Figure 16 shows the enhanced powerdown control logic. Note: When the ICL32xxE enters powerdown (manually
or automatically), the 30 second timer remains timed out (set), keeping the ICL32xxE powered down until
FORCEON transitions high, or until a transition occurs on a receiver or transmitter input.
FORCEOFF
Edge
T_IN
Detect
S
30s
AUTOSHDN
Timer
Edge
R_IN
Detect
R
FORCEON
Figure 16. Enhanced Automatic Powerdown Logic
The INVALID output signal switches low to indicate that invalid levels have persisted on all of the receiver inputs
for more than 30µs (see Figure 17), but this has no direct effect on the state of the ICL32xxE (see the next
sections for methods of using INVALID to power down the device). INVALID switches high 1µs after detecting a
valid RS-232 level on a receiver input. INVALID operates in all modes (forced or automatic powerdown, or forced
on), so it is also useful for systems employing manual powerdown circuitry.
FN4900 Rev.13.00
May.2.19
Page 17 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
FORCEON
ICL32xxE
INVALID
FORCEOFF
I/O
UART
CPU
Figure 17. Connections for Automatic Powerdown When No Valid Receiver Signals are Present
The time to recover from automatic powerdown mode is typically 100µs.
4.4.4 Emulating Standard Automatic Powerdown
If enhanced automatic powerdown is not desired, you can implement the standard automatic powerdown feature
(mimics the function on the ICL3221E/ICL3223E/ICL3243E) by connecting the INVALID output to the FORCEON
and FORCEOFF inputs, as shown in Figure 18. After 30µs of invalid receiver levels, INVALID switches low and
drives the ICL32xxE into a forced powerdown condition. INVALID switches high as soon as a receiver input
senses a valid RS-232 level, forcing the ICL32xxE to power on. See “ICL322XE - INVALID Driving FORCEON
and FORCEOFF (Emulates Automatic Powerdown)” on page 15 for an operational summary. This operational
mode is perfect for handheld devices that communicate with another computer through a detachable cable.
Detaching the cable allows the internal receiver pull-down resistors to pull the inputs to GND (an invalid RS-232
level), causing the 30µs timer to time out and drive the IC into powerdown. Reconnecting the cable restores valid
levels and causes the IC to power back up.
Receiver
Inputs
Invalid
Region
}
Transmitter
Inputs
Transmitter
Outputs
t
INVH
INVALID
Output
t
INVL
t
AUTOPWDN
t
WU
t
WU
t
AUTOPWDN
READY
Output
V+
V
CC
0
V-
Figure 18. Enhanced Automatic Powerdown, INVALID and READY Timing Diagrams
FN4900 Rev.13.00
May.2.19
Page 18 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
4.4.5 Hybrid Automatic Powerdown Options
For devices that communicate only through a detachable cable, you can connect INVALID to FORCEOFF (with
FORCEON = 0). While the cable is attached, INVALID and FORCEOFF remain high, so the enhanced automatic
powerdown logic powers down the RS-232 device whenever there is 30 seconds of inactivity on the receiver and
transmitter inputs. Detaching the cable allows the receiver inputs to drop to an invalid level (GND), so INVALID
switches low and forces the RS-232 device to power down. The ICL32xxE remains powered down until the cable
is reconnected (INVALID = FORCEOFF = 1), and a transition occurs on a receiver or transmitter input (see
Figure 16 on page 17). For immediate power up when the cable is reattached, connect FORCEON to
FORCEOFF through a network similar to that shown in Figure 14 on page 16.
4.5
READY Output (ICL3225E and ICL3227E Only)
The READY output indicates that the ICL322xE is ready to transmit. READY switches low whenever the device
enters powerdown, and switches back high during power-up when V- reaches -4V or lower.
4.6
Capacitor Selection
The charge pumps require 0.1µF capacitors for 3.3V operation. For other supply voltages see Table 6 for
capacitor values. Do not use values smaller than those listed in Table 6. Increasing the capacitor values (by a
factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C , C , and C can
2
3
4
be increased without increasing C ’s value, however, do not increase C without also increasing C , C , and C to
1
1
2
3
4
maintain the proper ratios (C to the other capacitors).
1
When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s Equivalent Series Resistance
(ESR) usually rises at low temperatures and it influences the amount of ripple on V+ and V-.
Table 6. Required Capacitor Values
VCC (V)
3.0 to 3.6
4.5 to 5.5
3.0 to 5.5
C1 (µF)
0.1
C2, C3, C4 (µF)
0.1
0.047
0.1
0.33
0.47
4.7
Power Supply Decoupling
In most circumstances a 0.1µF bypass capacitor is adequate. In applications that are particularly sensitive to
power supply noise, decouple V to ground with a capacitor of the same value as the charge-pump capacitor C .
CC
1
Connect the bypass capacitor as close as possible to the IC.
4.8
Operation Down to 2.7V
The ICL32xxE transmitter outputs meet RS-562 levels (±3.7V), at full data rate, with V as low as 2.7V. RS-562
CC
levels typically ensure interoperability with RS-232 devices.
4.9
Transmitter Outputs when Exiting Powerdown
Figure 19 on page 20 shows the response of two transmitter outputs when exiting powerdown mode. As they
activate, the two transmitter outputs properly go to opposite RS-232 levels, with no glitching, ringing, or
undesirable transients. Each transmitter is loaded with 3kΩ in parallel with 2500pF. Note: The transmitters enable
only when the magnitude of the supplies exceed approximately 3V.
FN4900 Rev.13.00
May.2.19
Page 19 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
5V/Div
FORCEOFF
T1
V
C
= +3.3V
- C = 0.1µF
4
CC
1
2V/Div
5V/Div
T2
READY
Time (20µs/Div)
Figure 19. Transmitter Outputs When Exiting Powerdown
4.10 Mouse Driveability
The ICL3245E is specifically designed to power a serial mouse while operating from low voltage supplies.
Figure 20 shows the transmitter output voltages under increasing load current. The on-chip switching regulator
ensures the transmitters supply at least ±5V during worst case conditions (15mA for paralleled V+ transmitters,
7.3mA for single V- transmitter).
6
5
V
+
4
3
OUT
V
= 3.0V
CC
2
T1
1
V
+
OUT
0
T2
T3
-1
-2
-3
-4
-5
-6
ICL3245E
V
V
-
CC
OUT
V
-
OUT
8
0
1
2
3
4
5
6
7
9
10
Load Current per Transmitter (mA)
Figure 20. Transmitter Output Voltage vs Load Current
(per Transmitter, For Example, Double Current Axis for Total VOUT+ Current)
4.11 High Data Rates
The ICL32xxE maintain the RS-232 ±5V minimum transmitter output voltages even at high data rates. Figure 21
on page 21 shows a transmitter loopback test circuit, and Figure 22 on page 21 shows the loopback test result at
250kbps. For this test, all transmitters were simultaneously driving RS-232 loads in parallel with 1000pF, at
250kbps. Figure 23 on page 21 shows the loopback results for a single transmitter driving 250pF and an RS-232
load at 1Mbps. The static transmitters were also loaded with an RS-232 receiver.
FN4900 Rev.13.00
May.2.19
Page 20 of 28
ICL3225E, ICL3227E, ICL3245E
4. Application Information
V
CC
+
0.1µF
V
CC
V+
V-
+
C1+
C1-
C2+
C2-
+
C
1
2
C
3
4
ICL32xxE
+
C
+
C
T
T
IN
OUT
C
L
R
IN
R
OUT
FORCEON
5k
V
CC
FORCEOFF
Figure 21. Transmitter Loopback Test Circuit
5V/Div
5V/Div
T1
T1
IN
IN
T1
T1
OUT
OUT
OUT
OUT
R1
R1
V
= +3.3V
V
= +3.3V
CC
CC
C
- C = 0.1µF
4
C
- C = 0.1µF
4
1
1
2µs/Div
0.5µs/Div
Figure 22. Loopback Test at 250kbps (CL = 1000pF)
Figure 23. Loopback Test at 1Mbps (CL = 250pF)
4.12 Interconnection with 3V and 5V Logic
The ICL32xxE directly interfaces with 5V CMOS and TTL logic families. The AC, HC, and CD4000 outputs can
drive the ICL32xxE inputs with the ICL32xxE at 3.3V and the logic supply at 5V, but ICL32xxE outputs do not
reach the minimum V for these logic families. See Table 7 for more information.
IH
Table 7. Logic Family Compatibility with Various Supply Voltages
System Power-Supply
Voltage (V)
V
CC Supply Voltage (V)
Compatibility
Compatible with all CMOS families.
3.3
5
3.3
5
Compatible with all TTL and CMOS logic families.
5
3.3
Compatible with ACT and HCT CMOS, and with TTL. ICL32xxE outputs are
incompatible with AC, HC, and CD4000 CMOS inputs.
FN4900 Rev.13.00
May.2.19
Page 21 of 28
ICL3225E, ICL3227E, ICL3245E
5. ±15kV ESD Protection
5. ±15kV ESD Protection
All pins on the ICL32xxE devices include ESD protection structures, but the ICL32xxE family incorporates
advanced structures that allow the RS-232 pins (transmitter outputs and receiver inputs) to survive ESD events
up to ±15kV. The RS-232 pins are particularly vulnerable to ESD damage because they typically connect to an
exposed port on the exterior of the finished product. Touching the port pins, or connecting a cable, can cause an
ESD event that might destroy unprotected ICs. The ESD structures protect the device whether or not it is powered
up, protect without allowing any latchup mechanism to activate, and do not interfere with RS-232 signals as large
as ±25V.
5.1
Human Body Model (HBM) Testing
The Human Body Model (HBM) test method emulates the ESD event delivered to an IC during human handling.
The tester delivers the charge through a 1.5kΩ current limiting resistor, so the test is less severe than the
IEC61000 test, which uses a 330Ω limiting resistor. The HBM method determines an IC’s ability to withstand the
ESD transients typically present during handling and manufacturing. Due to the random nature of these events,
each pin is tested with respect to all other pins. The RS-232 pins on “E” family devices can withstand HBM ESD
events to ±15kV.
5.2
IEC61000-4-2 Testing
The IEC61000 test method applies to finished equipment, rather than to an individual IC. Therefore, the pins most
likely to suffer an ESD event are those that are exposed to the outside world (the RS-232 pins in this case), and
the IC is tested in its typical application configuration (power applied) rather than testing each pin-to-pin
combination. The lower current limiting resistor coupled with the larger charge storage capacitor yields a test that
is much more severe than the HBM test. The extra ESD protection built into this device’s RS-232 pins allows the
design of equipment meeting Level 4 criteria without the need for additional board level protection on the RS-232
port.
5.3
Air-Gap Discharge Test Method
For the air-gap discharge test method, a charged probe tip moves toward the IC pin until the voltage arcs to it.
The current waveform delivered to the IC pin depends on factors such as approach speed, humidity, and
temperature, so it is difficult to obtain repeatable results. The “E” device RS-232 pins withstand ±15kV air-gap
discharges.
5.4
Contact Discharge Test Method
During the contact discharge test, the probe contacts the tested pin before the probe tip is energized, and
eliminates the variables associated with the air-gap discharge. The result is a more repeatable and predictable
test, but equipment limits prevent testing devices at voltages higher than ±8kV. All “E” family devices survive ±8kV
contact discharges on the RS-232 pins.
FN4900 Rev.13.00
May.2.19
Page 22 of 28
ICL3225E, ICL3227E, ICL3245E
6. Die Characteristics
6. Die Characteristics
Substrate Potential (Powered Up)
Transistor Count
GND
ISL3225E: 937
ISL3227E: 825
ISL3245E: 1109
Process
Si Gate CMOS
FN4900 Rev.13.00
May.2.19
Page 23 of 28
ICL3225E, ICL3227E, ICL3245E
7. Revision History
7. Revision History
Rev.
Date
Description
13
May.2.19
Updated to latest formatting.
Updated Ordering information table by adding active tape and reel information, updated notes, and removed
retired parts
Added “Charge Pump Abs Max Ratings” on page 12.
Removed About Intersil section.
Removed PDIP, TSSOP, and SOIC information throughout document.
Updated disclaimer.
12
Dec.12.15
Updated entire datasheet applying Intersil’s new standards.
Updated Ordering information table on page 2.
-Updated Tape and Reel note.
-Updated Note 2.
-Added MSL note.
-Removed all non-compliant products.
In the “Electrical Specifications” table under “ESD Performance” on page 9, Updated All Other pins section by
changing typical value for the ICL3245E from “±3” to “±2” and adding ICL3225E and ICL3227E information.
11
10
Dec.3.15
Updated Ordering Information Table on page 2: Added replacement part numbers for ICL3245ECBZ and
ICL3245ECVZ.
Aug.31.15
Ordering Information Table on page 2.
Added Revision History.
Added About Intersil Verbiage.
Updated POD M28.3 to latest revision changes: Added land pattern.
FN4900 Rev.13.00
May.2.19
Page 24 of 28
ICL3225E, ICL3227E, ICL3245E
8. Package Outline Drawings
For the most recent package outline drawing, see M16.209.
8. Package Outline Drawings
M16.209 (JEDEC MO-150-AC ISSUE B)
16 Lead Shrink Small Outline Plastic Package (SSOP
N
INCHES
MILLIMETERS
INDEX
SYMBOL
MIN
MAX
0.078
-
MIN
-
MAX
2.00
-
NOTES
0.25(0.010)
M
B M
H
AREA
E
A
A1
A2
B
-
-
GAUGE
PLANE
-B-
0.002
0.065
0.009
0.004
0.233
0.197
0.05
1.65
0.22
0.09
5.90
5.00
-
0.072
0.014
0.009
0.255
0.220
1.85
0.38
0.25
6.50
5.60
-
1
2
3
9
L
C
-
0.25
0.010
SEATING PLANE
A
D
3
-A-
D
E
4
e
0.026 BSC
0.65 BSC
-
-C-
0.292
0.022
0.322
0.037
7.40
0.55
8.20
0.95
-
H
A2
e
A1
L
6
C
B
N
a
16
16
7
0.10(0.004)
0°
8°
0°
8°
-
0.25(0.010) M
C
A M B S
Rev. 3 6/05
Notes:
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. Interlead
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 dimensions are
not necessarily exact.
FN4900 Rev.13.00
May.2.19
Page 25 of 28
ICL3225E, ICL3227E, ICL3245E
8. Package Outline Drawings
For the most recent package outline drawing, see M20.209.
M20.209 (JEDEC MO-150-AE ISSUE B)
20 Lead Shrink Small Outline Plastic Package (SSOP)
N
INCHES
MIN
MILLIMETERS
INDEX
M
M
B
0.25(0.010)
H
AREA
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
E
GAUGE
PLANE
A
A1
A2
B
0.068
0.002
0.066
0.010’
0.004
0.278
0.205
-B-
1
2
3
9
L
0.25
0.010
SEATING PLANE
A
C
-A-
D
3
4
D
E
-C-
e
0.026 BSC
0.65 BSC
0.301
0.025
0.311
0.037
7.65
0.63
7.90’
0.95
A2
e
H
A1
C
L
6
7
B
0.10(0.004)
N
a
20
20
M
M
S
B
0.25(0.010)
C
A
0 deg.
8 deg.
0 deg.
8 deg.
Rev. 3 11/02
Notes:
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.
Interlead 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
dimensions are not necessarily exact.
FN4900 Rev.13.00
May.2.19
Page 26 of 28
ICL3225E, ICL3227E, ICL3245E
8. Package Outline Drawings
For the most recent package outline drawing, see M28.209.
M28.209 (JEDEC MO-150-AH ISSUE B)
28 Lead Shrink Small Outline Plastic Package (SSOP)
N
INDEX
AREA
0.25(0.010)
M
B M
H
INCHES
MILLIMETERS
E
GAUGE
PLANE
SYMBOL
MIN
MAX
0.078
-
MIN
-
MAX
2.00
-
NOTES
-B-
A
A1
A2
B
-
-
0.002
0.065
0.009
0.004
0.390
0.197
0.05
1.65
0.22
0.09
9.90
5.00
-
1
2
3
0.072
0.014
0.009
0.413
0.220
1.85
0.38
0.25
10.50
5.60
-
L
0.25
0.010
SEATING PLANE
A
9
-A-
C
D
E
-
D
3
-C-
4
e
0.026 BSC
0.65 BSC
-
A2
e
A1
C
H
L
0.292
0.022
0.322
0.037
7.40
0.55
8.20
0.95
-
B
0.10(0.004)
6
0.25(0.010) M
C
A M B S
N
28
28
7
Notes:
0°
8°
0°
8°
-
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication Number 95.
Rev. 2 6/05
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.
Interlead 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 dimensions
are not necessarily exact.
FN4900 Rev.13.00
May.2.19
Page 27 of 28
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