74HC253 查看數據表（PDF） - Philips Electronics
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74HC253 Datasheet PDF : 7 Pages
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Philips Semiconductors
Dual 4-input multiplexer; 3-state
Product specification
74HC/HCT253
Fig.4 Functional diagram.
Fig.5 Logic diagram.
FUNCTION TABLE
SELECT INPUTS
S0
S1
nI0
X
X
X
L
L
L
L
L
H
H
L
X
H
L
X
L
H
X
L
H
X
H
H
X
H
H
X
NOTES
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
DATA INPUTS
nI1
nI2
X
X
X
X
X
X
L
X
H
X
X
L
X
H
X
X
X
X
OUTPUT ENABLE OUTPUT
nI3
nOE
nY
X
H
Z
X
L
L
X
L
H
X
L
L
X
L
H
X
L
L
X
L
H
L
L
L
H
L
H
December 1990
4
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