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LT1039AIN16

Triple RS232 Driver/Receiver with Shutdown

Linear Technology 

FEATURES

s On-Chip ESD Protection:

±15kV Human Body Model

±15kV IEC-1000-4-2 Air Gap Test**

±8kV IEC-1000-4-2 Contact Test

s 125kBd Operation with 3kΩ/2500pF Load

s 250kBd Operation with 3kΩ/1000pF Load

s Operates from ±5V to ±15V Supplies

s Fully Protected Against Overload

s Outputs Can Be Driven ±30V Without Damage

s Three-State Outputs; Outputs Open When Off

s Bipolar Circuit—No Latchup

s ±30V Input Range

s Triple Driver/Receiver

s No Supply Current in Shutdown

s 30kΩ Input Impedance

s Meets All RS232 Specifications

s 16-Pin Version—Pin Compatible with MC145406

s Available in SO Package

U

APPLICATIONS

s RS232 Interface

s Terminals

s Modems

LT1039A/LT1039A-16

Triple RS232 Driver/Receiver

with Shutdown

DESCRIPTION

The LT®1039A is a triple RS232 driver/receiver that

includes shutdown. Each receiver will accept up to ±30V

input and can drive either TTL or CMOS logic. The RS232

drivers accept TTL logic inputs and output RS232 voltage

levels. The outputs are fully protected against overload

and can be shorted to ground or up to ±30V without

damage to the drivers. Additionally, when the system is

shut down or power is off, the outputs are in a high

impedance state allowing data line sharing. On-chip ESD

protection eliminates the need for external protection

devices.

A bias pin allows one receiver to be kept on while the rest

of the part is shut down.

The LT1039A is also available in the 16-pin version,

without shutdown or bias pin functions.

For applications requiring operation from a single 5V

supply, see the LT1180A/LT1181A and LT1130A data

sheets.

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

TYPICAL APPLICATION

12V

BIAS*

RS232 IN

50Ω**

RS232 OUT

RS232 IN

*BIAS PIN USED

TO KEEP THE

RECEIVER ON

RS232 OUT

WHILE IN SHUTDOWN

**50Ω RESISTORS

MAY BE REQUIRED

FOR IEC-1000-4-2

ESD PROTECTION

RS232 OUT

DEPENDING UPON

PC BOARD AND

CONNECTOR LEAD LENGTH

50Ω**

RS232 IN

50Ω**

– 12V

1

2

V+

LT1039A VCC

18

17

5V

ON/OFF

3

16

LOGIC

30k

4

5

30k

15 LOGIC

14 LOGIC

6

7

30k

13

LOGIC

12

LOGIC

8

9 V–

11

LOGIC

10

GND

1039A TA01

Driver Output Swing

V+

– 0.4

– 0.8

– 1.2

– 1.6

– 2.0

1.2

0.8

0.4

V–

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

OUTPUT CURRENT (mA)

1039A TA02

1

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