SN75ALS1177, SN75ALS1178

DUAL DIFFERENTIAL DRIVERS AND RECEIVERS

SLLS154B – MARCH 1993 – REVISED FEBRUARY 2001

1

POST OFFICE BOX 655303

and TIA/EIA-485-A

on Long Bus Lines in Noisy Environments

50 mA Max

Limiting

Range of –7 V to 12 V

Range of –12 V to 12 V

Impedance ...12k

Ω Min

Enable for SN75ALS1177 Only

description

The SN75ALS1177 and SN75ALS1178 dual differential drivers and receivers are integrated circuits designed

for bidirectional data communication on multipoint bus transmission lines. They are designed for balanced

transmission lines and meet standards TIA/EIA-422-B and TIA/EIA-485-A.

The SN75ALS1177 combines dual 3-state differential line drivers and dual 3-state differential input line

receivers, both of which operate from a single 5-V power supply. The drivers and receivers have active-high

and active-low enables, respectively, which can be externally connected together to function as direction

control. The SN75ALS1178 drivers each have an individual active-high enable. Fail-safe design ensures that

when the receiver inputs are open, the receiver outputs are always high.

The SN75ALS1177 and SN75ALS1178 are characterized for operation from 0

°C to 70°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

TA

PLASTIC

DIP

(N)

PLASTIC

SMALL OUTLINE

(NS)

0

°Cto70°C

SN75ALS1177N

SN75ALS1177NSR

0

°C to 70°C

SN75ALS1178N

SN75ALS1178NSR

The NS package is only available taped and reeled. Add the

suffix R to the device type (e.g., SN75ALS1177NSR).

Copyright

 2001, 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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16

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9

1B

1A

1R

RE

2R

2A

2B

GND

1D

1Y

1Z

DE

2Z

2Y

2D

SN75ALS1177 ...N OR NS PACKAGE

(TOP VIEW)

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9

1B

1A

1R

1DE

2R

2A

2B

GND

1D

1Y

1Z

2DE

2Z

2Y

2D

SN75ALS1178 ...N OR NS PACKAGE

(TOP VIEW)