HD74LS42 Datasheet, PDF (2/7 Pages) Hitachi Semiconductor – BCD-to-Decimal Decoder

HD74LS42
Function Table
BCD input
Decimal output
No.
D
C
B
A
0
1
2
3
4
5
6
7
8
9
0
L
L
L
L
L
H
H
H
H
H
H
H
H
H
1
L
L
L
H
H
L
H
H
H
H
H
H
H
H
2
L
L
H
L
H
H
L
H
H
H
H
H
H
H
3
L
L
H
H
H
H
H
L
H
H
H
H
H
H
4
L
H
L
L
H
H
H
H
L
H
H
H
H
H
5
L
H
L
H
H
H
H
H
H
L
H
H
H
H
6
L
H
H
L
H
H
H
H
H
H
L
H
H
H
7
L
H
H
H
H
H
H
H
H
H
H
L
H
H
8
H
L
L
L
H
H
H
H
H
H
H
H
L
H
9
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
Invalid
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
H; high level, L; low level
Block Diagram
A
A
A
B
B
Inputs
B
C
C
C
D
D
D
0Y
1Y
2Y
3Y
4Y
Outputs
5Y
6Y
7Y
8Y
9Y
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Supply voltage
Input voltage
VCC
7
V
VIN
7
V
Power dissipation
Storage temperature
PT
400
mW
Tstg
–65 to +150
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Rev.3.00, Jul.22.2005, page 2 of 6