DM74ALS257

更新时间： 2024-11-07 22:56:51

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		复用器
页数	文件大小	规格书
7页	77K
描述
3-STATE Quad 1-of-2-Line Data Selector/Multiplexer

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中文翻译

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数据手册

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DM74ALS257 数据手册

April 1984

Revised February 2000

DM74ALS257 • DM74ALS258

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

General Description

Features

These data selectors/multiplexers contain inverters and

drivers to supply full on-chip data selection to the four 3-

STATE outputs that can interface directly with data lines of

bus-organized systems. A 4-bit word selected from one of

two sources is routed to the four outputs. The

DM74ALS257 presents true data whereas the

DM74ALS258 presents inverted data to minimize propaga-

tion delay time.

■ Switching specifications at 50 pF

■ Switching specifications guaranteed over full tempera-

ture and V_CCrange

■ Advanced oxide-isolated, ion-implanted Schottky TTL

process

■ Functionally and pin for pin compatible with Schottky

and low power Schottky TTL counterpart

■ Improved AC performance over Schottky and low power

Schottky counterparts

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.

■ 3-STATE buffer-type outputs drive bus lines directly

■ Expand any data input point

■ Multiplex dual data buses

■ General four functions of two variables (one variable is

common)

■ Source programmable counters

Ordering Code:

Order Number Package Number

Package Description

DM74ALS257M

DM74ALS257SJ

DM74ALS257N

DM74ALS258M

DM74ALS258N

M16A

M16D

N16E

M16A

N16E

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

16-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

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

16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow

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

Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Connection Diagram

Function Table

Inputs

Output Y

Output

Select

DM74ALS257 DM74ALS258

Control

H = HIGH Level

L = LOW Level

X = Don't Care

Z = High Impedance (OFF)

DS006227

www.fairchildsemi.com

12 3 4 5 6 7

中文翻译

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与DM74ALS257相关器件

型号	品牌	获取价格	描述	数据表
DM74ALS257J/A+	ETC	获取价格	2-Input Digital Multiplexer
DM74ALS257M	FAIRCHILD	获取价格	3-STATE Quad 1-of-2-Line Data Selector/Multiplexer
DM74ALS257M	ROCHESTER	获取价格	ALS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16, 0.150 INCH, MS-012, SO
DM74ALS257M/A+	ETC	获取价格	2-Input Digital Multiplexer
DM74ALS257M/B+	ETC	获取价格	2-Input Digital Multiplexer
DM74ALS257MX	ROCHESTER	获取价格	ALS SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16, 0.150 INCH, MS-012, SO
DM74ALS257MX_NL	FAIRCHILD	获取价格	暂无描述
DM74ALS257N	FAIRCHILD	获取价格	3-STATE Quad 1-of-2-Line Data Selector/Multiplexer
DM74ALS257N/A+	ETC	获取价格	2-Input Digital Multiplexer
DM74ALS257N/B+	ETC	获取价格	2-Input Digital Multiplexer

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