IN74HC157A 查看數據表（PDF） - IK Semicon Co., Ltd
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IN74HC157A Datasheet PDF : 6 Pages
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TECHNICAL DATA
Quad 2-Input Data Selectors/Multiplexer
IN74HC157A
The IN74HC157A is identical in pin out to the LS/ALS157. The device
inputs are compatible with standard CMOS outputs; with pull up resistors, they
are compatible with LS/ALSTTL outputs.
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 non inverted form. A
high level on the Output Enable input sets all four Y outputs to a low level.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HC157AN Plastic
IN74HC157AD SOIC
TA = -55° to 125° C for all packages
LOGIC DIAGRAM
PIN ASSIGNMENT
PIN 16 =VCC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Output
Enable
Select Y0-Y3
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
Rev. 00
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