SN74ALS156
DECODER/DEMULTIPLEXER
WITH OPEN-COLLECTOR OUTPUTS
SDAS099C – JUNE 1986 – REVISED MAY 1996
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Applications:
– 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
Individual Strobes Simplify Cascading for
Decoding or Demultiplexing Larger Words
Package Options Include Plastic
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
V
CC
2C
2G
A
2Y3
2Y2
2Y1
2Y0
