DM54LS257BW

更新时间： 2024-11-19 22:56:47

品牌	Logo	应用领域
美国国家半导体 - NSC		复用器逻辑集成电路
页数	文件大小	规格书
8页	166K
描述
TRI-STATE Quad 2-Data Selectors/Multiplexers

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中文翻译

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数据手册

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DM54LS257BW 数据手册

June 1989

54LS257A/DM54LS257B/DM74LS257B,

54LS258A/DM54LS258B/DM74LS258B

TRI-STATE Quad 2-Data Selectors/Multiplexers

Features

General Description

TRI-STATE versions LS157 and LS158 with same pin-

outs

These Schottky-clamped high-performance multiplexers

feature TRI-STATE outputs that can interface directly with

data lines of bus-organized systems. With all but one of the

common outputs disabled (at a high impedance state), the

low impedance of the single enabled output will drive the

bus line to a high or low logic level. To minimize the possibil-

ity that two outputs will attempt to take a common bus to

opposite logic levels, the output enable circuitry is designed

such that the output disable times are shorter than the out-

put enable times.

Schottky-clamped for significant improvement in A-C

performance

Provides bus interface from multiple sources in high-

performance systems

Average propagation delay from data input 12 ns

Typical power dissipation

LS257B 50 mW

LS258B 35 mW

This TRI-STATE output feature means that n-bit (paralleled)

data selectors with up to 258 sources can be implemented

for data buses. It also permits the use of standard TTL reg-

isters for data retention throughout the system.

Alternate military/aerospace devices (54LS257A/

54LS258A) are available. Contact a National Semicon-

ductor Sales Office/Distributor for specifications.

Connection Diagrams

Dual-In-Line Package

TL/F/6417–2

Order Number 54LS258ADMQB, 54LS258AFMQB,

54LS258ALMQB, DM54LS258BJ, DM54LS258BW,

DM74LS258BM or DM74LS258BN

TL/F/6417–1

Order Number 54LS257ADMQB, 54LS257AFMQB,

54LS257ALMQB, DM54LS257BJ, DM54LS257BW,

DM74LS257BM or DM74LS257BN

See NS Package Number E20A, J16A,

M16A, N16E or W16A

See NS Package Number E20A, J16A,

M16A, N16E or W16A

Function Table

Inputs

Output

Control

Output Y

Select

LS257 LS258

High Impedance (off)

Low Level, X Don’t Care,

High Level, L

TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/6417

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7 8

中文翻译

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与DM54LS257BW相关器件

型号	品牌	获取价格	描述	数据表
DM54LS257BW/883B	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,FP,16PIN,CERAMIC
DM54LS257BW/883C	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,FP,16PIN,CERAMIC
DM54LS257J/883	ETC	获取价格	2-Input Digital Multiplexer
DM54LS257J/883B	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,DIP,16PIN,CERAMIC
DM54LS257J/883C	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,DIP,16PIN,CERAMIC
DM54LS257W/883	ETC	获取价格	2-Input Digital Multiplexer
DM54LS257W/883B	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,FP,16PIN,CERAMIC
DM54LS257W/883C	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,FP,16PIN,CERAMIC
DM54LS258AE/883	ETC	获取价格	2-Input Digital Multiplexer
DM54LS258AJ/883	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,LS-TTL,DIP,16PIN,CERAMIC

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