TECHNICAL DATA
IN74HCT157A
Quad 2-Input Data Selectors/Multiplexer
High-Performance Silicon-Gate CMOS
The IN74HCT157A 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
IN74HCT157AN Plastic
IN74HCT157AD SOIC
TA = -55° to 125° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Output
Outputs
Y0-Y3
Select
Enable
PIN 16 =VCC
PIN 8 = GND
H
X
L
L
L
L
A0-A3
B0-B3
H
X=don’t care
A0-A3,B0-B3=the levels of the respective
Data-Word Inputs
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
