CD54HC21 Datasheet, PDF (2/10 Pages) Texas Instruments – High-Speed CMOS Logic Dual 4-Input AND Gate

Functional Diagram
CD54HC21, CD74HC21, CD74HCT21
1
1A
2
1B
4
1C
5
1D
9
2A
10
2B
12
2C
13
2D
6
1Y
8
2Y
GND = 7
V_CC = 14
NC = 3, 11
TRUTH TABLE
INPUTS
OUTPUT
nA
nB
nC
nD
nY
L
X
X
X
L
X
L
X
X
L
X
X
L
X
L
X
X
X
L
L
H
H
H
H
H
H = High Voltage Level, L = Low Voltage Level, X = Irrelevant
Logic Symbol
nA
nB
nY
nC
nD
2