HD74HC148 Datasheet, PDF (1/6 Pages) Hitachi Semiconductor – 8-to-3-line Octal Priority Encoder

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 A₀ - A₂) = 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
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC148P
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
P
HD74HC148FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
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
Rev.2.00, Oct 11, 2005 page 1 of 5