IN74ACT158

1

High-Speed Silicon-Gate CMOS

The IN74ACT158 is identical in pinout to the LS/ALS138,

HC/HCT138. The IN74ACT158 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 invertered form. A high level on the Output Enable

input sets all four Y outputs to a high 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; 0.1 µA @ 25°C

• Outputs Source/Sink 24 mA

ORDERING INFORMATION

IN74ACT158N Plastic

IN74ACT158D SOIC

packages

FUNCTION TABLE

Inputs

Outputs

Output

Enable

Select

Y0-Y3

H

X

H

L

L

A0-A3

L

H

B0-B3

X=don’t

care

A0-A3,B0-B3=the

levels

of

the

respective Data-Word Inputs

LOGIC DIAGRAM

PIN 8 = GND

PIN ASSIGNMENT