HD74HC157/HD74HC158

Quad. 2-to-1-line Data Selectors/Multiplexers

(with noninverted outputs)

Quad. 2-to-1-line Data Selectors/Multiplexers

(with inverted outputs)

ADE-205-454 (Z)

1st. Edition

Sep. 2000

Description

These devices each consist of four 2-input digital multiplexers with common select and strobe inputs. On

the HD74HC157, when the strobe input is at logical “L” the four outputs assume the values as selected

from the inputs.

When the strobe input is at a logical “H” the outputs assume logical “L”.

The

HD74HC158 operates in the same manner, except that its outputs are inverted. Select decoding is done

internally resulting in a single select input only. If enabled, the select input determines whether the A or B

inputs get routed to their corresponding Y outputs.

Features

• High Speed Operation: t

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I

Function Table

Inputs

Output Y

Strobe

Select

A

B

HC157

HC158

HX

X

X

L

H

L

L

LXL

H

LL

H

X

H

L

L

H

X

LLH

L

H

X

HHL