Rev.2.00, Oct 11, 2005 page 1 of 5

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

• High Output Current: Fanout of 10 LSTTL Loads

• Wide Operating Voltage: V

• Low Input Current: 1 µA max

• Low Quiescent Supply Current: I

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74HC147P

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

P

—

HD74HC147FPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

Note:

Please consult the sales office for the above package availability.

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