SN74ALS156

DECODER/DEMULTIPLEXER

WITH OPEN-COLLECTOR OUTPUTS

SDAS099C – JUNE 1986 – REVISED MAY 1996

1

POST OFFICE BOX 655303

– Dual 2-Line to 4-Line Decoder

– Dual 1-Line to 4-Line Demultiplexer

– 3-Line to 8-Line Decoder

– 1-Line to 8-Line Demultiplexer

Decoding or Demultiplexing Larger Words

Small-Outline (D) Packages and Standard

Plastic (N) 300-mil DIPs

description

One of the main applications of the SN74ALS156 is as a dual 1-line to 4-line decoder /demultiplexer with

individual strobes (G) and common binary-address inputs in a single 16-pin package. When both sections are

enabled, the common binary-address inputs sequentially select and route associated input data to the

appropriate output of each section. The individual strobes permit enabling or disabling each of the 4-bit sections,

as desired.

Data applied to input 1C is inverted at its outputs and data applied at input 2C is not inverted through its outputs.

The inverter following the 1C data input permits use of the SN74ALS156 as a 3-line to 8-line demultiplexer

without external gating. All inputs are clamped with high-performance Schottky diodes to suppress line ringing

and simplify system design.

The SN74ALS156 is characterized for operation from 0

°C to 70°C.

Copyright

© 1996, 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.

D OR N PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

1C

1G

B

1Y3

1Y2

1Y1

1Y0

GND

2C

2G

A

2Y3

2Y2

2Y1

2Y0