LT1331CG#PBF [Linear]
LT1331 - 3V RS562 or 5V/3V RS232 Transceiver with One Receiver Active in Shutdown; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C;
| 型号： | LT1331CG#PBF |
| 厂家： | 
Linear |
| 描述： | LT1331 - 3V RS562 or 5V/3V RS232 Transceiver with One Receiver Active in Shutdown; Package: SSOP; Pins: 28; Temperature Range: 0°C to 70°C 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总8页 (文件大小：220K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
LT1331
3V RS562 or 5V/3V RS232
Transceiver with One Receiver
Active in Shutdown
U
DESCRIPTIO
EATURE
RS232 Compatible 3V Operation
3V Logic Interface
S
F
The LT®1331 is a 3-driver, 5-receiver RS232 transceiver
designed for 3V and mixed 3V/5V systems. Receivers
operate from 3V logic supply V , while the onboard charge
pump and drivers operate from 5V or 3V supply V .
■
■
■
■
■
■
ESD Protection Over ±10kV
L
120kbaud Operation for RL = 3k, CL = 2500pF
250kbaud Operation for RL = 3k, CL = 1000pF
One Low Power Receiver Remains Active While
in Shutdown
CC
The transceiver has two shutdown modes. One mode
disables the drivers and the charge pump, the other shuts
down all circuitry except for one low power receiver which
canbeusedforringdetection. TheVCC supplymaybeshut
down while in ring detection mode. While shut down, the
drivers and receivers assume high impedance output
states.
■
■
■
■
■
■
■
60µA Supply Current in Shutdown
Low Power Driver Disable Mode
Uses Small Capacitors: 0.1µF, 0.2µF
CMOS Comparable Low Power: 60mW
Easy PC Layout: Flowthrough Architecture
Rugged Bipolar Design
The LT1331 is fully compliant with all EIA-RS232 specifi-
cations when VCC = 5V. If VCC = 3V, output drive levels are
compatible with all known interface circuits. Special bipo-
lar construction techniques protect the drivers and receiv-
ers beyond the fault conditions stipulated for RS232. The
RS232I/Opinsareresilienttomultiple ±10kVESDstrikes.
An advanced driver output stage operates up to 120kbaud
while driving heavy capacitive loads.
Outputs Assume a High Impedance State When
Off or Powered Down
O U
PPLICATI
A
S
■
Notebook Computers
Palmtop Computers
■
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
O
TYPICAL APPLICATI
3.3V Operation
RECEIVER
OUTPUT
+
–
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
+
C
L = 50pF
0.1µF
0.1µF
V
= 3.3V
+
CC
2 × 0.1µF
3
LT1331
+
+
2 × 0.1µF
4
DRIVER 1 IN
RX1 OUT
5
DRIVER
OUTPUT
R
DRIVER 1 OUT
RX1 IN
6
DRIVER 2 IN
RX2 OUT
R
L = 3k
7
C
L = 2500pF
DRIVER 2 OUT
RX2 IN
8
TO LOGIC
RX3 OUT
TO LINE
9
RX3 IN
RX4 OUT
10
11
12
13
14
RX4 IN
DRIVER 3 IN
RX5 OUT (LOW-Q)
INPUT
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
RING DETECT IN
GND
µCONTROLLER
OR
µPROCESSOR
1331 TA02
DRIVER DISABLE
NC
3.3V V
L
SHUTDOWN
CONTROL OUT
1331 TA01
1
LT 1331
W W W
U
/O
ABSOLUTE AXI U RATI GS
PACKAGE RDER I FOR ATIO
(Note 1)
TOP VIEW
Supply Voltage (VCC) ................................................ 6V
Supply Voltage (VL) .................................................. 6V
V+ ........................................................................ 13.2V
V– ...................................................................... –13.2V
Input Voltage
ORDER PART
+
–
V
1
2
3
4
5
6
7
8
9
28
V
NUMBER
–
+
5V/3V V
27 C2
26 C2
CC
+
C1
LT1331CG
LT1331CNW
LT1331CSW
–
C1
25 DRIVER 1 IN
24 RX1 OUT
DRIVER 1 OUT
RX1 IN
Driver ........................................................... V+ to V–
Receiver ................................................ 30V to –30V
ON/OFF ...................................... –0.3V to VCC + 0.3V
DRIVER DISABLE ...................... –0.3V to VCC + 0.3V
Output Voltage
23 DRIVER 2 IN
22 RX2 OUT
DRIVER 2 OUT
RX2 IN
21 RX3 OUT
RX3 IN
20 RX4 OUT
RX4 IN 10
19 DRIVER 3 IN
RX5 OUT
(LOW-Q)
17 GND
DRIVER
DISABLE
15 NC
DRIVER 3 OUT 11
18
Driver ................................................... – 30V to 30V
Receiver ...................................... – 0.3V to VL + 0.3V
Short Circuit Duration
RX5 IN
(LOW-Q)
ON/OFF 13
12
16
14
3.3V V
L
V+ ................................................................... 30 sec
V– ................................................................... 30 sec
Driver Output.............................................. Indefinite
Receiver Output.......................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
G PACKAGE
NW PACKAGE
28-LEAD PDIP
28-LEAD SSOP
SW PACKAGE
28-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 96°C/ W (G)
TJMAX = 125°C, θJA = 56°C/ W (NW)
TJMAX = 125°C, θJA = 85°C/ W (SW)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS (Note 2)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Power Supply Generator
+
V Output
V
V
V
V
= 5V
= 3.3V
= 5V
= 3.3V
8.6
5.5
– 7.0
–4.8
V
V
V
V
CC
CC
–
V Output
CC
CC
Supply Current (V
)
CC
V
V
= 5V (Note 3)
= 3.3V
●
●
12
12
17
17
mA
mA
CC
CC
Supply Current (V )
Supply Current When OFF (V
(Note 4)
Shutdown (Note 5)
Driver Disable
●
●
3
2
0.1
5
50
1
mA
µA
mA
L
)
CC
Supply Current When OFF (V )
Shutdown (Note 5)
Driver Disable
C1 = C2 = 0.2µF, C = C = 0.1µF
Input Low Level (Device Shut Down)
Input High Level (Device Enabled)
●
60
3
0.2
1.4
1.4
100
5
µA
mA
ms
V
V
L
+
–
Supply Rise Time, Shutdown to Turn-On
ON/OFF Pin Thresholds
●
●
0.8
2.4
ON/OFF Pin Current
0V ≤ V
≤ 5V
●
–15
80
µA
ON/OFF
DRIVER DISABLE Pin Thresholds
Input Low Level (Drivers Enabled)
Input High Level (Drivers Disabled)
●
●
1.4
1.4
0.8
V
V
2.4
DRIVER DISABLE Pin Current
Oscillator Frequency
0V ≤ V
≤ 5V
●
–10
500
µA
kHz
DRIVER DISABLE
130
2
LT1331
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Any Driver
Output Voltage Swing, Positive
V
V
V
V
= 5V, R = 3k
●
●
5.0
3.7
6.5
4.0
–6.0
–3.3
1.4
1.4
V
V
V
V
V
V
CC
CC
L
= 3.3V, R = 3k
L
Output Voltage Swing, Negative
Logic Input Voltage Level
= 5V, R = 3k
–5.0
–2.7
0.8
CC
CC
L
= 3.3V, R = 3k
L
Input Low Level (V
Input High Level (V
= High)
= Low)
●
●
OUT
2.0
OUT
Logic Input Current
0.8V ≤ V ≤ 2V
●
5
17
10
20
µA
mA
µA
kBaud
kBaud
IN
Output Short-Circuit Current
Output Leakage Current
Data Rate (Note 8)
V
= 0V
±9
OUT
Shutdown V
= ±30V (Note 5)
●
100
30
OUT
R = 3k, C = 2500pF
120
250
L
L
R = 3k, C = 1000pF
L
L
Slew Rate
R = 3k, C = 51pF
15
6
V/µs
V/µs
L
L
R = 3k, C = 2500pF
L
L
Propagation Delay
Output Transition t High to Low (Note 6)
0.6
0.5
1.3
1.3
µs
µs
HL
Output Transition t Low to High
LH
Any Receiver
Input Voltage Thresholds
Input Low Threshold (V
Input High Threshold (V
= High)
= Low)
●
●
0.8
1.3
1.7
0.4
5
V
V
V
OUT
2.4
1.0
7
OUT
Hysteresis
●
0.1
3
Input Resistance
Receivers 1 Through 4
Output Voltage
V
= ±10V
kΩ
IN
Output Low, I
Output High, I
= –1.6mA
= 160µA (V = 3.3V)
●
●
0.2
2.4
–20
20
250
350
0.4
V
V
mA
mA
ns
ns
OUT
2.0
10
OUT
L
Output Short-Circuit Current
Propagation Delay
Sinking Current, V
= V
–10
OUT
CC
= 0V
Sourcing Current, V
OUT
Output Transition t High to Low (Note 7)
600
600
HL
Output Transition t Low to High
LH
Output Leakage Current
Receiver 5 (Low Q-Current RX)
Output Voltage
Shutdown (Note 5) 0 ≤ V
≤ V
●
1
10
µA
OUT
CC
Output Low, I
Output High, I
= –500µA
= 160µA (V = 3V)
●
●
0.2
2.4
–4
4
1
1
0.4
–2
V
V
mA
mA
µs
µs
OUT
2.0
2
OUT
L
Output Short-Circuit Current
Propagation Delay
Sinking Current, V
Sourcing Current, V
= V
OUT
CC
= 0V
OUT
Output Transition t High to Low (Note 7)
3
3
HL
Output Transition t Low to High
LH
The
●
denotes specifications which apply over the full operating
Note 6: For driver delay measurements, R = 3k and C = 51pF. Trigger
L L
temperature range (0°C ≤ T ≤ 70°C for commercial grade).
Note 1: Absolute Maximum Ratings are those values beyond which the life
points are set between the driver’s input logic threshold and the output
transition to the zero crossing (t = 1.4V to 0V and t = 1.4V to 0V).
A
HL
LH
of a device may be impaired.
Note 7: For receiver delay measurements, C = 51pF. Trigger points are
set between the receiver’s input logic threshold and the output transition
L
Note 2: Testing done at V = 5V, V = 3.3V, and V = 3V, unless
ON/OFF
CC
L
to standard TTL/CMOS logic threshold (t = 1.3V to 2.0V and t = 1.7V
otherwise stated.
HL
LH
to 0.8V).
Note 3: Supply current is measured as the average over several charge
+
–
Note 8: Data rate operation guaranteed by slew rate, short-circuit current
and propagation delay tests.
pump cycles. C = 1µF, C = 0.1µF, C1 = C2 = 0.2µF. All outputs are open
with all driver inputs tied high.
Note 4: V supply current is measured with all receiver outputs high.
L
Note 5: Supply current and leakage current measurements in shutdown
are performed with V
driver disable are performed with V
≤ 0.1V. Supply current measurements using
ON/OFF
≥ 3V.
DRIVER DISABLE
3
LT 1331
TYPICAL PERFOR A CE CHARACTERISTICS
U W
Driver Short-Circuit Current
Driver Output Voltage
Driver Output Voltage
30
25
20
15
10
5
–2
–3
–4
–5
–6
–7
–8
8
7
6
5
4
3
2
V
= 5V
CC
OUTPUT LOW
OUTPUT HIGH
V
CC
= 5V
V
CC
= 3.3V
+
I
SC
–
I
SC
V
CC
= 3.3V
V
CC
= 5V
R
= 3k
R = 3k
L
L
3 DRIVERS
LOADED
3 DRIVERS
LOADED
0
50
TEMPERATURE (°C)
100 125
–55 –25
0
25
75
50
TEMPERATURE (°C)
100 125
–55
25
50
75
100 125
–55 –25
0
25
75
–25
0
TEMPERATURE (°C)
1331 G01
1331 G02
1331 G03
Driver Leakage in Shutdown
Slew Rate vs Load Capacitance
Slew Rate vs Load Capacitance
16
14
12
10
8
16
14
12
10
8
100
10
1
V
= 3.3V
V
CC
= 5V
CC
–SLEW
–SLEW
V
= 30V
OUT
6
6
+SLEW
V
= –30V
OUT
4
4
+SLEW
2
2
2
0.1
0
0
–55
0
25
50
75 100 125
1
3
–25
0
1
3
4
5
0
4
5
2
TEMPERATURE (°C)
LOAD CAPACITANCE (nF)
LOAD CAPACITANCE (nF)
1331 G04
1331 G05
1331 G06
Receiver Input Thresholds
Supply Current vs Data Rate
Receiver Short-Circuit Current
50
40
30
20
10
0
40
30
20
10
0
3.00
R
C
= 3k
= 2500pF
V
L
= 3.3V
V
= 3.3V
L
L
L
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
–
I
SC
V
CC
= 5V
V
CC
= 3.3V
+
INPUT HIGH
INPUT LOW
I
SC
3 DRIVERS
1 DRIVER
V
= 5V
CC
V
= 3.3V
CC
0
50
75
100
125
150
50
TEMPERATURE (°C)
125
25
–55
–25
0
25
75 100
–55
0
25
50
75 100 125
–25
DATA RATE (kBAUD)
TEMPERATURE (°C)
1131 G07
1331 G09
1331 G08
4
LT1331
U
U
U
PI FU CTIO S
V+ (Pin 1): Positive Supply Output. V+ 2VCC – 1.5V. This
pin requires an external capacitor for charge storage,
chosen to minimize ripple to acceptable levels. A mini-
mum size of 0.1µF is recommended.
ON/OFF (Pin 13): A TTL/CMOS Compatible Operating
Mode Control. A logic low puts the device in the shutdown
mode. All drivers and four of the receivers go to a high
impedance state, and the VCC supply may be turned off. A
logic high fully enables the transceiver.
VCC (Pin 2): Power Supply for Charge Pump and Drivers.
Proper circuit operation is insured for VCC = 3V to 6V.
VCC = 5V operation gives full RS232 compliant perfor-
mance, 3V operation results in lower driver output ampli-
tude. The VCC pin should be decoupled with a 0.1µF
ceramic capacitor.
C1+, C1–, C2+, C2– (Pins 3, 4, 26, 27):These pins require
two external capacitors C ≥ 0.2µF. One from C1+ to C1–,
and another from C2+ to C2–. To maintain charge pump
efficiency,thecapacitor’seffectiveseriesresistanceshould
be less than 2Ω. Low ESR tantalum capacitors work well
in this application, small value ceramic capacitors may
also be used with minimal reduction in charge pump
compliance.
VL (Pin 14): Power Supply for Receivers. This pin should
be powered to the same voltage as the logic circuits
connected to the receiver outputs, either 5V or 3V. The VL
pin should be decoupled with a 0.1µF ceramic capacitor.
DRIVER DISABLE (Pin 16): A logic high shuts down the
chargepump,placingalldriversinahighimpedancestate.
All receivers remain active. Floating the pin, or driving it
to a logic low, fully enables the transceiver. A low voltage
on the ON/OFF pin supersedes the state of the driver
disable control.
GND (Pin 17): Ground.
LOW-Q RX OUT (Pin 18): Low Power Receiver Output.
This pin produces the same output levels as standard
receivers,withslightlydecreasedspeedandshort-circuit
current.
DRIVER OUT (Pins 5, 7, 11): RS232 Driver Outputs.
Outputsareinahighimpedancestatewheninshutdown,
driver disable, or VCC = 0V. Outputs are fully short-circuit
protected from V– + 30V to V+ – 30V. Although the
outputs are protected, short circuits on one output can
load the power supply generator and may disrupt the
signal levels of the other outputs. The driver outputs are
protected against ESD to ±10kV for human body model
discharges. Output levels of –3.3V to 4V are achieved
when the circuit is operated with VCC = 3.3V.
DRIVER IN (Pins 19, 23, 25): RS232 Driver Inputs.
Inputs are TTL/CMOS compatible. Tie unused inputs
to VCC.
RX OUT (Pins 20, 21, 22, 24): Receiver Outputs. RX1
through RX4 outputs are in a high impedance state when
in shutdown mode to allow data line sharing. Outputs,
including LOW-Q RX OUT, are fully short-circuit pro-
tected to ground, VCC, or VL. Output voltage levels are
determined by the choice of power supply VL.
RX IN (Pins 6, 8, 9, 10): Receiver Inputs with 0.4V of
HysteresisforNoiseImmunity. ThesepinsacceptRS232
level signals (±30V) into a protected 5k terminating
resistor. ThereceiverinputsareprotectedagainstESDto
±10kV for human body model discharges.
V– (Pin 28): Negative Supply Output. V– –(2VCC
–
2.5V). This pin requires an external charge storage
capacitor, chosen to minimize ripple on V–. A minimum
value of 0.1µF is recommended.
LOW-Q RX IN (Pin 12): Low Power Receiver Input. This
receiver remains active in shutdown mode, consuming
only 60µA from supply VL. This receiver has the same
input and protection characteristics as receivers RX1
through RX4.
5
LT 1331
PPLICATI
O U
W
U
A
S I FOR ATIO
Power Saving Operational Modes
Mixed 5V/3V Operation
The LT1331 has both shutdown and driver disable oper- When operated with VCC = 5V and VL = 3.3V supplies, the
atingmodes.Theseoperatingmodescanoptimizepower RS232driversmeetorexceedallRS232orV.28commu-
consumption based upon applications needs.
nication interface standards. Data rates up to 120kbaud
are supported, and all standard RS232 compatible mice
may be driven by the LT1331.
The shutdown control turns off all circuitry except for
Low-Q RX5. RX5 operates entirely from the VL power
supply, so the power consumption from VCC drops to
zero. The VCC power supply may be turned off while in
shutdwon, which may allow greater power savings in
some systems. When RX5 detects a signal, this informa-
tion can be used to wake up the system for full operation.
3V Operation
VCC =3.3VoperationoftheLT1331resultsinlowerdriver
outputswingthanwithVCC =5V.Thedriveroutputswing,
when operated with VCC = 3.3V, is guaranteed to be at
least –2.7V to 3.7V, with typical swing being –3.3V to 4V.
ThisinsurescompatibilitywithallcommonlyusedRS232
and RS562 interface circuits. Table 1 summarizes the
receiverinputthresholdspecificationsforRS232circuits
from many manufacturers.
If more than one line must be monitored, the driver
disable mode provides a power efficient operating
option. The driver disable mode turns off the charge
pumps and RS232 drivers, but keeps all five receivers
active.Powerconsumptionindriverdisablemodeis3mA
from VL and less than 100µA from VCC.
Table 1. Commonly Used RS232 Interface Circuit Receiver Thresholds
INPUT LOW THRESHOLD
INPUT HIGH THRESHOLD
MANUFACTURER
Linear Technology
PART NUMBER
LT1080
COMPATIBLE
MIN
TYP
1.3
1.3
1.3
1.3
MAX
MIN
TYP
1.7
1.7
1.7
1.7
MAX
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
0.8
0.8
0.8
0.8
–
–
–
–
–
–
–
–
2.4
2.4
2.4
2.4
LT1137A
LT1330
LT1281
All Others
SN75189
SN75189A
MAX232
SN75C185
MAX232A
MAX241
SP232
Texas Instruments
0.65
0.65
0.8
0.65
0.8
1.0
1.0
1.2
1.0
1.3
1.2
1.2
–
1.25
1.25
–
1.25
–
0.9
1.55
–
1.6
–
1.3
1.9
1.7
2.1
1.8
1.5
1.7
–
1.6
2.25
2.4
2.55
2.4
Maxim
Sipex
0.6
0.8
–
–
–
–
2.4
2.4
SP301
0.75
0.75
0.75
0.75
0.5
1.35
1.25
1.25
1.25
1.9
1.75
1.0
1.75
1.0
1.3
2.5
Motorola
National
MC1489
MC1489A
DS1489
–
–
1.5
2.25
1.5
0.8
1.0
–
1.95
1.25
–
DS14C89A
2.7
6
LT1331
U
ESD PROTECTIO
ESD Test Circuit
The RS232 line inputs of the LT1331 have on-chip protec-
tion from ESD transients up to ±10kV. The protection
structures act to divert the static discharge safely to
systemground. InorderfortheESDprotectiontofunction
effectively, the power supply and ground pins of the
LT1331 must be connected to ground through low imped-
ances.Thepowersupplydecouplingcapacitorsandcharge
pump storage capacitors provide this low impedance in
normalapplicationofthecircuit.Theonlyconstraintisthat
low ESR capacitors must be used for bypassing and
charge storage. ESD testing must be done with pins VCC,
VL, V+, V– and GND shorted to ground or connected with
low ESR capacitors.
+
–
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
5V V
0.1µF
0.2µF
CC
+
+
+
3
LT1331
+
0.1µF
0.1µF
+
0.2µF
4
DRIVER 1 IN
RX1 OUT
5
DRIVER 1 OUT
RX1 IN
6
DRIVER 2 IN
RX2 OUT
7
DRIVER 2 OUT
RX2 IN
RS232
8
RX3 OUT
LINE PINS
9
PROTECTED
RX3 IN
RX4 OUT
10
11
12
13
14
TO ±10kV
RX4 IN
DRIVER 3 IN
RX5 OUT (LOW-Q)
GND
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
DRIVER DISABLE
NC
3.3V
+
1331 ESD TC
0.1µF
U
Dimensions in inches (millimeters) unless otherwise noted.
PACKAGE DESCRIPTIO
G Package
28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.397 – 0.407*
(10.07 – 10.33)
28 27 26 25 24 23 22 21 20 19 18
0.205 – 0.212**
(5.20 – 5.38)
0.068 – 0.078
(1.73 – 1.99)
16 15
17
0° – 8°
0.301 – 0.311
(7.65 – 7.90)
0.0256
(0.65)
BSC
0.005 – 0.009
(0.13 – 0.22)
0.022 – 0.037
(0.55 – 0.95)
0.002 – 0.008
(0.05 – 0.21)
0.010 – 0.015
(0.25 – 0.38)
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
5
7
8
1
2
3
4
6
9 10 11 12 13 14
G28 SSOP 0694
NW Package
28-Lead PDIP (Wide 0.600)
(LTC DWG # 05-08-1520)
1.455*
(36.957)
MAX
0.600 – 0.625
0.070
(1.778)
TYP
0.150 ± 0.005
0.045 – 0.065
(1.143 – 1.651)
(15.240 – 15.875)
(3.810 ± 0.127)
0.015
28
27
26
25
24
23
22
21
20
19
18
17
16
15
(0.381)
MIN
0.009 – 0.015
(0.229 – 0.381)
+0.035
–0.015
+0.889
0.625
15.87
0.035 – 0.080
(0.889 – 2.032)
0.018 ± 0.003
(0.457 ± 0.076)
0.125
(3.175)
MIN
(
)
–0.381
1
2
3
5
7
9
4
6
8
10
11
12
13
14
0.100 ± 0.010
(2.540 ± 0.254)
0.505 – 0.560*
N28 1197
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
(12.827 – 14.224)
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
7
LT 1331
U
Dimensions in inches (millimeters) unless otherwise noted.
SW Package
PACKAGE DESCRIPTIO
28-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.697 – 0.712*
(17.70 – 18.08)
0.291 – 0.299**
(7.391 – 7.595)
28 27 26 25 24 23 22 21 20 19 18
16 15
17
0.010 – 0.029
(0.254 – 0.737)
0.037 – 0.045
(0.940 – 1.143)
0.093 – 0.104
(2.362 – 2.642)
× 45°
0° – 8°
TYP
NOTE 1
0.050
(1.270)
TYP
0.004 – 0.012
(0.102 – 0.305)
0.394 – 0.419
(10.007 – 10.643)
0.009 – 0.013
(0.229 – 0.330)
NOTE 1
0.014 – 0.019
(0.356 – 0.482)
TYP
0.016 – 0.050
(0.406 – 1.270)
NOTE:
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
2
3
5
7
8
9
10 11 12 13 14
1
4
6
S28 (WIDE) 0996
U
O
TYPICAL APPLICATI
Mixed 5V/3V Supply Operation
+
–
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V
V
RECEIVER
OUTPUT
+
0.1µF
0.1µF
+
V
= 5V
CC
C
L = 50pF
2 × 0.1µF
3
LT1331
+
+
2 × 0.1µF
4
DRIVER 1 IN
RX1 OUT
5
DRIVER 1 OUT
RX1 IN
6
DRIVER
DRIVER 2 IN
RX2 OUT
OUTPUT
L = 3k
7
DRIVER 2 OUT
RX2 IN
R
8
TO LOGIC
RX3 OUT
CL = 2500pF
TO LINE
9
RX3 IN
RX4 OUT
10
11
12
13
14
RX4 IN
DRIVER 3 IN
RX5 OUT (LOW-Q)
INPUT
DRIVER 3 OUT
RX5 IN (LOW-Q)
ON/OFF
GND
DRIVER DISABLE
NC
1331 TA04
V
L
= 3.3V
1331 TA03
RELATED PARTS
PART NUMBER
LT1130A/LT1140A
LT1137A
DESCRIPTION
COMMENTS
10kV ESD
15kV ESD
5V RS232 Transceivers with Small Capacitors
3-DR/5-RX RS232 Transceiver
LTC1349
5V Low Power, 3-DR/5-RX RS232 Transceiver
3.3V Low Power EIA/TIA-562 Transceiver
2-DR/2-RX RS232 Transceivers
2 RXs Active in Shutdown
LTC1385
LT1780/LT1781
15kV ESD
1331fa LT/TP 0998 REV A 2K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1993
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
8
●
●
(408)432-1900 FAX:(408)434-0507 www.linear-tech.com
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