HD74LS148 Datasheet, PDF (2/6 Pages) Hitachi Semiconductor – 8-line-to-3-line Octal Priority Encoders

HD74LS148
Function Table
Inputs
Outputs
EI
0
1
2
3
4
5
6
7
A2
A1
A0
GS EO
H
X
X
X
X
X
X
X
X
H
H
H
H
H
L
H
H
H
H
H
H
H
H
H
H
H
H
L
L
X
X
X
X
X
X
X
L
L
L
L
L
H
L
X
X
X
X
X
X
L
H
L
L
H
L
H
L
X
X
X
X
X
L
H
H
L
H
L
L
H
L
X
X
X
X
L
H
H
H
L
H
H
L
H
L
X
X
X
L
H
H
H
H
H
L
L
L
H
L
X
X
L
H
H
H
H
H
H
L
H
L
H
L
X
L
H
H
H
H
H
H
H
H
L
L
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
H ; high level, L ; low level, X ; irrelevant
Block Diagram
0
EO
1
GS
2
A0
3
4
A1
5
6
7
A2
EI
Absolute Maximum Ratings
Item
Symbol
Ratings
Unit
Supply voltage
V_CC
7
V
Input voltage
V_IN
7
V
Power dissipation
P_T
400
mW
Storage temperature
Tstg
–65 to +150
°C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Rev.2.00, Feb.18.2005, page 2 of 5