CD74HC42 Datasheet, PDF (2/6 Pages) Texas Instruments – High Speed CMOS Logic BCD To Decimal Decoder 1 of 10

Functional Diagram
CD74HC42, CD74HCT42
15
A0
14
A1
13
A2
12
A3
1
Y0
2
Y1
3
Y2
4
Y3
5
Y4
6
Y5
7
Y6
9
Y7
10
Y8
11
Y9
TRUTH TABLE
INPUTS
OUTPUTS
A3
A2
A1
A0
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
Y8
Y9
L
L
L
L
L
H
H
H
H
H
H
H
H
H
L
L
L
H
H
L
H
H
H
H
H
H
H
H
L
L
H
L
H
H
L
H
H
H
H
H
H
H
L
L
H
H
H
H
H
L
H
H
H
H
H
H
L
H
L
L
H
H
H
H
L
H
H
H
H
H
L
H
L
H
H
H
H
H
H
L
H
H
H
H
L
H
H
L
H
H
H
H
H
H
L
H
H
H
L
H
H
H
H
H
H
H
H
H
H
L
H
H
H
L
L
L
H
H
H
H
H
H
H
H
L
H
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
NOTE: H = High Voltage Level, L = Low Voltage Level
2