SN55138, SN75138

QUADRUPLE BUS TRANSCEIVERS

SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995

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POST OFFICE BOX 655303

Receivers

With Clamp Diodes

description

The SN55138 and SN75138 quadruple bus

transceivers are designed for two-way data

communication over single-ended transmission

lines. Each of the four identical channels consists

of a driver with TTL inputs and a receiver with a

TTL output. The driver open-collector output is

designed to handle loads up to 100-mA open

collector.

The

receiver

input

is

internally

connected to the driver output, and has a high

impedance

to

minimize

loading

of

the

transmission line. Because of the high driver-

output current and the high receiver-input

impedance, a very large number (typically

hundreds) of transceivers may be connected to a

single data bus.

The receiver design also features a threshold of 2.3 V (typical), providing a wider noise margin than would be

possible with a receiver having the usual TTL threshold. A strobe turns off all drivers (high impedance) but does

not affect receiver operation. These circuits are designed for operation from a single 5-V supply and include a

provision to minimize loading of the data bus when the power-supply voltage is zero.

The SN55138 is characterized for operation over the full military temperature range of – 55

°C to 125°C. The

SN75138 is characterized for operation from 0

°C to 70°C.

Copyright

© 1995, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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2

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

4R

4D

NC

S

3D

1R

1D

NC

2D

2R

SN55138 . . . FK PACKAGE

(TOP VIEW)

NC – No internal connection

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2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

GND

1B

1R

1D

2D

2R

2B

GND

4B

4R

4D

S

3D

3R

3B

SN55138 ...J OR W PACKAGE

SN75138 ...D OR N PACKAGE

(TOP VIEW)