1

LT1039/LT1039-16

1039fd

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

RS232 Driver/Receiver

with Shutdown

The LT

cludes 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. Bipolar cir-

cuitry makes this driver/receiver exceptionally rugged

against overloads and immune to latchup.

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

of the part is shut down.

The LT1039 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 LT1080/LT1081, LT1180A/LT1181A and

LT1130A data sheets. For applications requiring 15kV

ESD, see the LT1039A.

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

s

Operates from

±5V to ±15V Supplies

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Fully Protected Against Overload

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Outputs Can Be Driven

±30V Without Damage

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Three-State Outputs; Outputs Open When Off

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Bipolar Circuit—No Latchup

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±30V Input Range

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Triple Driver/Receiver

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No Supply Current in Shutdown

s

30k

Ω Input Impedance

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Meets All RS232 Specifications

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16-Pin Version—Pin Compatible with MC145406

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Available in SO Package

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15kV ESD: LT1039A

s

RS232 Interface

s

Terminals

s

Modems

Driver Output Swing

30k

LT1039

1

2

3

4

5

6

7

8

9

18

17

16

15

14

13

12

11

10

GND

12V

BIAS*

RS232 IN

ON/OFF

5V

LOGIC

LOGIC

LOGIC

LOGIC

LOGIC

LOGIC

*BIAS PIN USED

TO KEEP THE

RECEIVER ON

WHILE IN SHUTDOWN

RS232 IN

RS232 OUT

RS232 OUT

RS232 OUT

RS232 IN

– 12V

1039 TA01

30k

30k

OUTPUT CURRENT (mA)

0

– 0.5

8

1039 TA02

0.5

1.0

1.5

2

4

6

10

NEGATIVE

POSITIVE