CD74HC20 Datasheet, PDF (2/6 Pages) Texas Instruments – High Speed CMOS Logic Dual 4-Input NAND Gate

Functional Diagram
CD74HC20, CD74HCT20
1
1A
2
1B
3
NC
4
1C
5
1D
6
1Y
7
GND
14
V_CC
13
2D
12
2C
11
NC
10
2B
9
2A
8
2Y
HC Logic Symbol
TRUTH TABLE
INPUTS
OUTPUT
nA
nB
nC
nD
nY
L
X
X
X
H
X
L
X
X
H
X
X
L
X
H
X
X
X
L
H
H
H
H
H
L
NOTE: H = High Voltage Level, L = Low Voltage Level, X = Irrelevant
HCT Logic Symbol
nA
nA
nB
nY
nB
nC
nD
nY
nC
nD
2