Philips Semiconductors
Product specification
Dual 4-input multiplexer; 3-state
74HC/HCT253
Fig.4 Functional diagram.
Fig.5 Logic diagram.
FUNCTION TABLE
SELECT INPUTS
DATA INPUTS
OUTPUT ENABLE OUTPUT
S0
S1
nI0
nI1
nI2
nI3
nOE
nY
X
X
X
X
X
X
H
Z
L
L
H
H
L
L
L
L
L
H
X
X
X
X
L
X
X
X
X
X
X
X
X
L
L
L
L
L
H
L
H
H
L
L
H
H
H
H
H
H
X
X
X
X
X
X
X
X
L
H
X
X
X
X
L
L
L
L
L
L
H
L
H
H
NOTES
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
December 1990
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