DM74S257

更新时间： 2024-09-26 04:39:03

品牌	Logo	应用领域
美国国家半导体 - NSC		复用器
页数	文件大小	规格书
8页	145K
描述
TRI-STATE QUAD 1 OF 2 DATA SELECTORS / MULTIPLEXERS

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数据手册

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DM74S257 数据手册

June 1989

DM54S257/DM74S257, DM54S258/DM74S258

TRI-STATE Quad 1 of 2 Data Selectors/Multiplexers

General Description

Features

TRI-STATE versions S157, S158, with same pin-outs

Schottky-clamped for significant improvement in A-C

performance

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.

Provides bus interface from multiple sources in high-

performance systems

Average propagation delay from data input

S257 4.8 ns

S258 4 ns

Typical power dissipation

S257 320 mW

S258 280 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.

Connection Diagrams

Dual-In-Line Package

TL/F/6482–1

TL/F/6482–2

Order Number DM54S257J, DM54S258J, DM54S257W, DM74S257N or DM74S258N

See NS Package Number J16A, N16E or W16A

Function Table

Inputs

Select

Output Y

Output

Control

S257

S258

Don’t Care

High Level, L

Low Level, X

High Impedance (off)

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

1995 National Semiconductor Corporation

TL/F/6482

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

12 3 4 5 6 7 8

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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