74HC21 Просмотр технического описания (PDF) - Philips Electronics
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74HC21 Datasheet PDF : 6 Pages
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Philips Semiconductors
Dual 4-input AND gate
Product specification
74HC/HCT21
Fig.4 Functional diagram.
FUNCTION TABLE
INPUTS
nA
nB
nC
nD
L
X
X
X
X
L
X
X
X
X
L
X
X
X
X
L
H
H
H
H
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
OUTPUT
nY
L
L
L
L
H
Fig.5 Logic diagram (one gate).
December 1990
4
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