TECHNICAL DATA
IN74ACT157
Quad 2-Input Data Selector/Multiplexer
High-Speed Silicon-Gate CMOS
The IN74ACT157 is identical in pinout to the LS/ALS157,
HC/HCT157. The IN74ACT157 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.
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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
IN74ACT157N Plastic
IN74ACT157D SOIC
TA = -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Output
Outputs
Y0-Y3
Select
Enable
H
X
L
L
PIN 16 =VCC
PIN 8 = GND
L
L
A0-A3
B0-B3
H
X=don’t care
A0-A3,B0-B3=the levels of the respective
Data-Word Inputs
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