IN74ACT158
QUAD 2-INPUT DATA SELECTOR/MULTIPLEXER
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
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Outputs
Y0-Y3
Output
Select
Enable
H
L
L
X
L
H
H
A0-A3
B0-B3
PIN 16 =VCC
PIN 8 = GND
X=don’t
care
A0-A3,B0-B3=the levels of the
respective Data-Word Inputs
1
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