1

LT1130A/LT1140A Series

Advanced Low Power

5V RS232 Drivers/Receivers

with Small Capacitors

s

ESD Protection over

±10kV

(

±15kV IEC-1000-4-2 for LT1133A, LT1137A

and LT1141A)

s

Uses Small Capacitors: 0.1

µF, 0.2µF

s

1

µA Supply Current in SHUTDOWN

s

s

s

CMOS Comparable Low Power

s

Easy PC Layout: Flowthrough Architecture

s

Rugged Bipolar Design: Absolutely No Latchup

s

Outputs Assume a High Impedance State When Off

or Powered Down

s

Improved Protection: RS232 I/O Lines Can Be Forced

to

±30V Without Damage

s

Output Overvoltage Does Not Force Current Back

into Supplies

s

Available in SO and SSOP Packages

The LT

ers features special bipolar construction techniques which

protect the drivers and receivers beyond the fault condi-

tions stipulated for RS232. Driver outputs and receiver

inputs can be shorted to

±30V without damaging the

device or the power supply generator. In addition, the

RS232 I/O pins are resilient to multiple

±10kV ESD strikes.

An advanced driver output stage operates up to 250kbaud

while driving heavy capacitive loads. Supply current is

typically 12mA, competitive with CMOS devices.

Several members of the series include flexible operating

mode controls. The DRIVER DISABLE pin disables the

drivers and the charge pump, the ON/OFF pin shuts down

all circuitry. While shut down, the drivers and receivers

assume high impedance output states.

, LTC and LT are registered trademarks of Linear Technology Corporation.

LT1136A 4-Driver/5-Receiver RS232 Transceiver w/Shutdown

LT1137A 3-Driver/5-Receiver RS232 Transceiver w/Shutdown

LT1138A 5-Driver/3-Receiver RS232 Transceiver w/Shutdown

LT1139A 4-Driver/4-Receiver RS232 Transceiver w/Shutdown

LT1140A 5-Driver/3-Receiver RS232 Transceiver w/o Charge Pump

LT1141A 3-Driver/5-Receiver RS232 Transceiver w/o Charge Pump

LT1130A 5-Driver/5-Receiver RS232 Transceiver

LT1131A 5-Driver/4-Receiver RS232 Transceiver w/Shutdown

LT1132A 5-Driver/3-Receiver RS232 Transceiver

LT1133A 3-Driver/5-Receiver RS232 Transceiver

LT1134A 4-Driver/4-Receiver RS232 Transceiver

LT1135A 5-Driver/3-Receiver RS232 Transceiver w/o Charge Pump

R

LT1130A • TA02

RECEIVER

OUTPUT

DRIVER

OUTPUT

INPUT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

DRIVER OUT

RX IN

DRIVER OUT

RX IN

RX IN

RX IN

DRIVER OUT

RX IN

ON/OFF = 5V

DRIVER IN

RX OUT

DRIVER IN

RX OUT

RX OUT

RX OUT

DRIVER IN

RX OUT

0.1

µF

0.1

µF

× 2

0.1

µF

× 2

0.1

µF

GND

DRIVER DISABLE

TO LINE

TO LOGIC

1130A • TA01

LT1137A

Basic Operation

Output Waveforms

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO