IN74HCT157A
Q
UAD
2-I
NPUT
D
ATA
S
ELECTORS
/M
ULTIPLEXER
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
T
A
= -55° to 125° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =V
CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Output
Select
Y0-Y3
Enable
H
X
L
L
L
A0-A3
L
H
B0-B3
X=don’t care
A0-A3,B0-B3=the levels of the
respective Data-Word Inputs
1
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