HD74HC147 Datasheet, PDF (1/6 Pages) Hitachi Semiconductor – 10-to-4-line Priority Encoder

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
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74HC147P
DILP-16 pin
PRDP0016AE-B _P
(DP-16FV)
HD74HC147FPEL SOP-16 pin (JEITA)
PRSP0016DH-B _FP
(FP-16DAV)
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
—
EL (2,000 pcs/reel)
Function Table
Inputs
Outputs
1
2
3
4
5
6
7
8
9
D
C
B
A
H
H
H
H
H
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
X
L
L
H
H
L
X
X
X
X
X
X
X
L
H
L
H
H
H
X
X
X
X
X
X
L
H
H
H
L
L
L
X
X
X
X
X
L
H
H
H
H
L
L
H
X
X
X
X
L
H
H
H
H
H
L
H
L
X
X
X
L
H
H
H
H
H
H
L
H
H
X
X
L
H
H
H
H
H
H
H
H
L
L
X
L
H
H
H
H
H
H
H
H
H
L
H
L
H
H
H
H
H
H
H
H
H
H
H
L
H : High level
L : Low level
X : Irrelevant
Rev.2.00, Oct 11, 2005 page 1 of 5