SL74HCT157 Просмотр технического описания (PDF) - System Logic Semiconductor

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SL74HCT157

Quad 2-Input Data Selectors/Multiplexer

System Logic Semiconductor 

SL74HCT157

Quad 2-Input Data Selectors/Multiplexer

High-Performance Silicon-Gate CMOS

The SL74HCT157 is identical in pinout to the LS/ALS157. This

device may be used as a level converter for interfacing TTL or NMOS

outputs to High Speed CMOS inputs.

This device routes 2 nibbles (A or B) to a single port (Y) as

determined by the Select input. The data is presented at the outputs in

noninvertered form. A high level on the Output Enable input sets all

four Y outputs to a low level.

• TTL/NMOS Compatible Input Levels

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 4.5 to 5.5 V

• Low Input Current: 1.0 µA

ORDERING INFORMATION

SL74HCT157N Plastic

SL74HCT157D SOIC

TA = -55° to 125° C for all packages

LOGIC DIAGRAM

PIN ASSIGNMENT

PIN 16 =VCC

PIN 8 = GND

SLS

System Logic

Semiconductor

FUNCTION TABLE

Inputs

Outputs

Output

Enable

Select

Y0-Y3

H

X

L

L

L

A0-A3

L

H

B0-B3

X=don’t care

A0-A3,B0-B3=the levels of the respective

Data-Word Inputs

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