DM74S257

更新时间： 2024-09-25 22:54:35

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		复用器
页数	文件大小	规格书
5页	50K
描述
3-STATE Quad 1-of-2 Data Selector/Multiplexer

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数据手册

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DM74S257 数据手册

August 1986

Revised May 2000

DM74S257

3-STATE Quad 1-of-2 Data Selector/Multiplexer

General Description

Features

These Schottky-clamped high-performance multiplexers

feature 3-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 pos-

sibility 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 output enable times.

■ 3-STATE versions S157, S158, with same pin-outs

■ Schottky-clamped for significant improvement in

A-C performance

■ Provides bus interface from multiple sources in high-per-

formance systems

■ Average propagation delay from data input 4.8 ns

■ Typical power dissipation

320 mW

This 3-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.

Ordering Code:

Order Number Package Number

Package Description

DM74S257N

N16E

16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide

Connection Diagram

Function Table

Inputs

Select

Output

Control

H = HIGH Level

L = LOW Level

X = Don’t Care

Z = High Impedance (OFF)

DS006482

www.fairchildsemi.com

12 3 4 5

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与DM74S257相关器件

型号	品牌	获取价格	描述	数据表
DM74S257CW	FAIRCHILD	获取价格	Multiplexer, S Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, WAFER
DM74S257J	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,S-TTL,DIP,16PIN,CERAMIC
DM74S257J/A+	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,S-TTL,DIP,16PIN,CERAMIC
DM74S257N	FAIRCHILD	获取价格	3-STATE Quad 1-of-2 Data Selector/Multiplexer
DM74S257N	TI	获取价格	S SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16, PLASTIC, DIP-16
DM74S257N	NSC	获取价格	TRI-STATE QUAD 1 OF 2 DATA SELECTORS / MULTIPLEXERS
DM74S257N/A+	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,S-TTL,DIP,16PIN,PLASTIC
DM74S257N/B+	TI	获取价格	IC,LOGIC MUX,QUAD,2-INPUT,S-TTL,DIP,16PIN,PLASTIC
DM74S258	NSC	获取价格	TRI-STATE QUAD 1 OF 2 DATA SELECTORS / MULTIPLEXERS
DM74S258J	ROCHESTER	获取价格	Multiplexer