HD74HC147
10-to-4-line Priority Encoder
REJ03D0572-0200
(Previous ADE-205-446)
Rev.2.00
Oct 11, 2005
Description
The HD74HC147 features priority encoding of the inputs to ensure that only the highest order data line is encoded.
Nine input lines are encoded to a four line BCD output. The implied decimal zero condition requires no input condition
as zero is encoded when all nine data lines are at a high logic level. All data inputs and outputs are active at the low
logic level.
Features
•
•
•
•
•
•
High Speed Operation: t
pd
= 14.5 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
HD74HC147P
HD74HC147FPEL
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
1
H
X
X
X
X
X
X
X
X
L
H:
L:
X:
2
H
X
X
X
X
X
X
X
L
H
High level
Low level
Irrelevant
3
H
X
X
X
X
X
X
L
H
H
4
H
X
X
X
X
X
L
H
H
H
Inputs
5
H
X
X
X
X
L
H
H
H
H
6
H
X
X
X
L
H
H
H
H
H
7
H
X
X
L
H
H
H
H
H
H
8
H
X
L
H
H
H
H
H
H
H
9
H
L
H
H
H
H
H
H
H
H
D
H
L
L
H
H
H
H
H
H
H
Outputs
C
B
H
H
H
L
L
L
L
H
H
H
H
H
H
L
L
H
H
L
L
H
A
H
L
H
L
H
L
H
L
H
L
Rev.2.00, Oct 11, 2005 page 1 of 5
RENESAS [ RENESAS TECHNOLOGY CORP ]
