MM54HC147 datasheet(1/4 Pages) NSC

Part #	MM54HC147

Description	10-to-4 Line Priority Encoder

PDF	4 Pages

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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TLF5007

November 1995

MM54HC147MM74HC147

10-to-4 Line Priority Encoder

General Description

This high speed 10-to-4 Line Priority Encoder utilizes ad-

vanced silicon-gate CMOS technology It possesses the

high noise immunity and low power consumption of stan-

dard CMOS integrated circuits This device is fully buffered

giving it a fanout of 10 LS-TTL loads

The MM54HC147MM74HC147 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

The 54HC74HC logic family is functionally as well as pin-

out compatible with the standard 54LS74LS logic family

All inputs are protected from damage due to static dis-

charge by internal diode clamps to VCC and ground

Features

Y

Low quiescent power consumption 40 mW maximum at

25 C

Y

High speed 31 ns propagation delay (typical)

Y

Low input current 1 mA maximum

Y

Wide supply range 2V to 6V

Connection and Logic Diagrams

Dual-In-Line Package

TLF5007 – 1

Top View

Order Number MM54HC147 or MM74HC147

Truth Table

Inputs

Outputs

123456789

D

C

B

A

HHHHHHHHHHHHH

XXXXXXXX

L

H

L

XXXXXXX

LHLH

H

XXXXXX

LH

H

L

XXXXX

L

HHHH

L

H

XXXX

L

HHHH

HLHL

X

L

HHHHHH

L

H

X

L

HHHHHHHH

L

X

L

HHHHHHHHH

L

H

L

HHHHHHHHHHH

L

H e High Logic Level L e Low Logic Level X e Irrelevant

TLF5007 – 2

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A

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NXP Semiconductors	74HC147	120Kb / 23P	10-to-4 line priority encoder 2003 Oct 30
STMicroelectronics	HCC40147B	275Kb / 12P	10 TO 4 LINE BCD PRIORITY ENCODER Apr-1991
STMicroelectronics	M54HC147	241Kb / 10P	10 TO 4 LINE PRIORITY ENCODER Oct-1992
Texas Instruments	CD40147B	436Kb / 10P	10-LINE TO 4-LINE BCD PRIORITY ENCODER
Hitachi Semiconductor	HD74HC147	43Kb / 8P	10-to-4-line Priority Encoder
Intersil Corporation	ACS147MS	39Kb / 2P	Radiation Hardened 10-to-4 Line Priority Encoder July 1999
Intersil Corporation	CD40147BMS	81Kb / 8P	10 Line to 4 Line BCD Priority Encoder December 1992
NXP Semiconductors	74HC147N	43Kb / 7P	10-TO-4 LINE PRIORITY ENCODER December 1990
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MM54HC147 Datasheet(PDF) 1 Page - National Semiconductor (TI)

MM54HC147 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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