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MULTIPLEXERS : IC49(74VHC157FT)
Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators
in a mixed 3.3-V/5-V system environment.
logic diagram (positive logic)
1A
1B
2A
2B
3A
3B
4A
4B
G
A/B
Pin numbers shown are for the D, DB, J, NS, PW, RGY, and W packages.
FUNCTION TABLE
INPUTS
G
A/B
H
X
L
L
L
L
L
H
L
H
2
3
5
6
11
10
14
13
15
1
OUTPUT
OUTPUT
Y
A
B
X
X
L
L
X
L
H
X
H
X
L
L
X
H
H
2-33
4
1Y
7
2Y
9
3Y
12
4Y
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