MM54HC147/MM74HC147优先级编码器：竞赛获奖资源

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"74HC147是一款高速10线到4线优先编码器，由中国大学生在电子设计竞赛中使用的资料。这款器件采用了先进的CMOS硅门工艺，具有高噪声免疫力和低功耗特性，非常适合于对性能和效率有高要求的应用。它能够确保只有最高优先级的数据线被编码，将10路输入信号转换为4位BCD码输出。特别地，当所有9个数据线处于高逻辑电平时，零被隐含地编码，无需额外条件。该编码器的特点包括： 1. 高性能：具有31纳秒典型传播延迟，表明其响应速度快，能满足实时系统的需求。 2. 低功耗：在25摄氏度下，最大低功耗仅为40毫瓦，这对于能源效率优化的设计至关重要。 3. 高隔离性：所有的输入端口都通过内置二极管钳位保护，防止因静电损伤而损坏电路。 4. 兼容性：MM54HC147/MM74HC147与标准54LS/74LS逻辑家族在功能和引脚配置上完全兼容，方便设计师在现有系统中替换或扩展。在电子设计竞赛中，使用这款编码器可以提高系统的可靠性和效率，帮助参赛者实现快速、准确的数据处理，从而增加获胜的可能性。这篇论文不仅提供了技术细节，还可能是学生们研究和实验的宝贵参考资料，对于理解优先级编码原理、电路设计和集成芯片应用有着重要的价值。对于那些对数字逻辑设计、硬件实现或者嵌入式系统开发感兴趣的学生来说，这是一个值得深入学习和实践的实例。"

TL/F/5007

MM54HC147/MM74HC147 10-to-4 Line Priority Encoder

November 1995

MM54HC147/MM74HC147

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 MM54HC147/MM74HC147 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 54HC/74HC logic family is functionally as well as pin-

out compatible with the standard 54LS/74LS logic family.

All inputs are protected from damage due to static dis-

charge by internal diode clamps to V

and ground.

Features

Low quiescent power consumption: 40 mW maximum at

High speed: 31 ns propagation delay (typical)

Low input current: 1 mA maximum

Wide supply range: 2V to 6V

Connection and Logic Diagrams

Dual-In-Line Package

TL/F/5007–1

Top View

Order Number MM54HC147 or MM74HC147

Truth Table

Inputs Outputs

123456789DCBA

HHHHHHHHHHHHH

XXXXXXXXLLHHL

XXXXXXXLHLHHH

XXXXXXLHHHLLL

XXXXXLHHHHL LH

XXXXLHHHHHLHL

XXX LHHHHHHLHH

XX LHHHHHHHHL L

XLHHHHHHHHHLH

LHHHHHHHHHHHL

High Logic Level, L

Low Logic Level, X

Irrelevant

TL/F/5007–2

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

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