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HD74AC157
Quad 2-Input Multiplexer
Description
The HD74AC157 is a high-speed quad 2-input multiplexer. Four bits of data from two sources can be selected using the common Select and Enable inputs. The four outputs present the selected data in the true (noninverted) form. The HD74AC157 can also be used as a function generator.
Feature
• Outputs Source/Sink 24 mA
Pin Arrangement
S 1 I0a 2 I1a 3 Za 4 I0b 5 I1b 6 Zb 7 GND 8 (Top view)
16 VCC 15 E 14 I0c 13 I1c 12 Zc 11 I0d 10 I1d 9 Zd
HD74AC157
Logic Symbol
E
I0a I1a I0b I1b I0c
I1c Iod I1d
S Za Zb Zc Zd
Pin Names
I0a to I0d I1a to I1d E S Za to Zd Source 0 Data Inputs Source 1 Data Inputs Enable Input Select Input Outputs
Functional Description
The HD74AC157 is a quad 2-input multiplexer.