HD74HC148
8-to-3-line Octal Priority Encoder
REJ03D0573-0200
(Previous ADE-205-447)
Rev.2.00
Oct 11, 2005
Description
HD74HC148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and
enable output EO) is provided to allow octal expansion without the need for external circuitry. The data inputs and
outputs are active at the low logic level.
Features
•
•
•
•
•
•
High Speed Operation: t
pd
(0 - 7 to A
0
- A
2
) = 15 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1
µA
max
Low Quiescent Supply Current: I
CC
(static) = 4
µA
max (Ta = 25°C)
Ordering Information
Part Name
HD74HC148P
HD74HC148FPEL
Package Type
DILP-16 pin
SOP-16 pin (JEITA)
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
Package
Abbreviation
P
—
EL (2,000 pcs/reel)
Taping Abbreviation
(Quantity)
PRSP0016DH-B
FP
(FP-16DAV)
Note: Please consult the sales office for the above package availability.
Function Table
EI
H
L
L
L
L
L
L
L
L
L
H:
L:
X:
0
X
H
X
X
X
X
X
X
X
L
High level
Low level
Irrelevant
1
X
H
X
X
X
X
X
X
L
H
2
X
H
X
X
X
X
X
L
H
H
Inputs
3
X
H
X
X
X
X
L
H
H
H
4
X
H
X
X
X
L
H
H
H
H
5
X
H
X
X
L
H
H
H
H
H
6
X
H
X
L
H
H
H
H
H
H
7
X
H
L
H
H
H
H
H
H
H
A
2
H
H
L
L
L
L
H
H
H
H
A
1
H
H
L
L
H
H
L
L
H
H
Outputs
A
0
H
H
L
H
L
H
L
H
L
H
GS
H
H
L
L
L
L
L
L
L
L
EO
H
L
H
H
H
H
H
H
H
H
Rev.2.00, Oct 11, 2005 page 1 of 5
RENESAS [ RENESAS TECHNOLOGY CORP ]
