1

LT1180A/LT1181A

Low Power 5V RS232

Dual Driver/Receiver with

0.1

µF Capacitors

R

Output Waveforms

LT1180A • TA02

DRIVER

OUTPUT

RECEIVER

OUTPUT

INPUT

APPLICATI

TYPICAL

5k

5k

0.1

µF

LOGIC

INPUTS

LOGIC

OUTPUTS

ON/OFF

18

10

13

11

12

6

5

4

2

16

9

14

8

15

7

3

17

5V INPUT

RS232 OUTPUT

RS232 OUTPUT

RS232 INPUT

RS232 INPUT

LT1180A • TA01

LT1180A

+

0.1

µF

+

0.1

µF

0.1

µF

+

s

ESD Protection over

±10kV

s

Uses Small Capacitors: 0.1

µF

s

s

s

Outputs Withstand

±30V Without Damage

s

CMOS Comparable Low Power: 40mW

s

Operates from a Single 5V Supply

s

Rugged Bipolar Design

s

Outputs Assume a High Impedance State When Off

or Powered Down

s

Meets All RS232 Specifications

s

Available With or Without Shutdown

s

Absolutely No Latch-up

s

Available in SO Package

S

FEATURE

DESCRIPTIO

s

Portable Computers

s

Battery-Powered Systems

s

Power Supply Generator

s

Terminals

s

Modems

S

APPLICATI

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

TransZorb is a registered trademark of General Instruments, GSI

The LT

pairs with integral charge pump to generate RS232 volt-

age levels from a single 5V supply. These circuits feature

rugged bipolar design to provide operating fault tolerance

and ESD protection unmatched by competing CMOS

designs. Using only 0.1

µF external capacitors, these cir-

cuits consume only 40mW of power, and can operate to

120k baud even while driving heavy capacitive loads. New

ESD structures on the chip allow the LT1180A/LT1181A to

survive multiple

±10kV strikes, eliminating the need for

costly TransZorbs

LT1181A are fully compliant with EIA RS232 standards.

Driver outputs are protected from overload, and can be

shorted to ground or up to

±30V without damage. During

shutdown or power-off conditions, driver and receiver

outputs are in a high impedance state, allowing line

sharing.

The LT1181A is available in 16-pin DIP and SO packages.

The LT1180A is supplied in 18-pin DIP and SO packages

for applications which require shutdown.