SL74HCT139

System Logic

Semiconductor

SLS

Dual 1-of-4 Decoder/Demultiplexer

High-Performance Silicon-Gate CMOS

The SL74HCT139A is identical in pinout to the LS/ALS139. The

SL74HCT139A may be used as a level converter for interfacing TTL or

NMOS outputs to High Speed CMOS inputs.

This device consists of two independent 1-of-4 decoders, each of

which decodes a two -bit Address to one-of-four active-low outputs.

Active-low Selects are provided to facilitate the demultiplexing and

cascading functions. The demultiplexing function is accomplished by

using the Address inputs to select the desired device output, and

utilizing the Select as a data input.

• 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

SL74HCT139N Plastic

SL74HCT139D SOIC

° to 125° C for all packages

FUNCTION TABLE

Inputs

Outputs

Select

A1

A0

Y0

Y1

Y2

Y3

H

X

X

H

H

H

H

L

L

L

L

H

H

H

L

L

H

H

L

H

H

L

H

L

H

H

L

H

L

H

H

H

H

H

L

X = don’t care

LOGIC DIAGRAM

PIN 8 = GND

PIN ASSIGNMENT