Fairchild Semiconductor DM74S158N, DM74S157N Datasheet

DM74S157 • DM74S158
Quad 1 of 2 Line Data Selector/Multiplexer

DM74S157 • DM74S158 Quad 1 of 2 Line Data Selector/Multiplexer

August 1986
Revised April 2000

General Description

These data selectors/multiplexers contain inverters and
drivers to supply full on-chip da ta selection to the fo ur out­put gates. A separate strobe input is provided. A 4-bit word
is selected from one o f two sources and is route d to the
four outputs. The DM74 S157 presents true data where as
the DM74S158 presents i nverted data to minim ize propa­gation delay time.

Applications

• Expand any data input point

• Multiplex dual data buses

• Generate four fun ction s of tw o va riab l es ( on e v aria bl e is
common)

• Source programmable counters

Features

■ Buffered inputs and outputs

■ Typical propagation time

DM74S157 5 ns
DM74S158 4 ns

■ Typical power dissipation

DM74S157 250 mW
DM74S158 195 mW

Ordering Code:

Order Number Package Number Package Description

DM74S157N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74S158N N16E 16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Connection Diagrams

DM74S157 DM74S158

© 2000 Fairchild Semiconductor Corporation DS006470 www.fairchildsemi.com

Function Table

H = HIGH Level
L = LOW Level

DM74S157 • DM74S158

X = Don’t Care

Logic Diagrams

Inputs Output Y

Strobe Select A B DM74S157 DM74S158

HXXXLH
LLLXLH
LLHXHL
LHXLLH
LHXHHL

DM74S157

DM74S158

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