DM54155/DM74155 Dual 2-Line to 4-Line Decoders/Demultiplexers

General Description

These TTL circuits feature dual 1-line-to-4-line demultiplexers with individual strobes and common

binary-address inputs in a single 16-pin package. When both sections are enabled by the strobes, the

common address inputs sequentially select and route associated input data to the appropriate

output of each section. The individual strobes permit activating or inhibiting each of the 4-bit sections

as desired. Data applied to input C1 is inverted at its outputs and data applied at C2 is true through its

outputs. The inverter following the C1 data input permits use as a 3-to-8-line decoder, or 1-to-8-line

demultiplexer, without external gating. Input clamping diodes are provided on these circuits to

minimize transmission-line effects and simplify system design.

Features

Applications:

Dual 2-to-4-line decoder

Dual 1-to-4-line demultiplexer

3-to-8-line decoder

1-to-8-line demultiplexer

Individual strobes simplify cascading for decoding or

demultiplexing larger words

Input clamping diodes simplify system design

Connection Diagram and Function Tables

Dual-In-Line Package

2-Line-to-4-Line Decoder or 1-Line-to-4-Line Demultiplexer

Inputs

Select

Strobe

Data

Outputs

BA

G1

C1

1Y0

1Y1

1Y2

1Y3

XX

H

X

H

H

H

H