DM74AS257

更新时间： 2024-09-29 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
6页	63K
描述
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

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中文翻译

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数据手册

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DM74AS257 数据手册

September 1986

Revised March 2000

DM74AS257 • DM74AS258

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

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 DM74AS257

presents true data whereas the DM74AS258 presents

inverted data to minimize propagation 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,

low power Schottky, and advanced low power Schottky

TTL counterpart

This 3-STATE output feature means that n-bit (paralleled)

data selectors with up to 300 sources can be implemented

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

isters for data retention throughout the system.

■ Improved AC performance over Schottky, low power

Schottky, and advanced low power Schottky counter-

parts

■ 3-STATE buffer-type output 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

DM74AS257M

DM74AS257N

DM74AS258M

DM74AS258N

M16A

N16E

M16A

N16E

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

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

AS257 AS258

CONTROL

H = HIGH Level

L = LOW Level

X = Don't Care

Z = High Impedance (OFF)

DS006107

www.fairchildsemi.com

12 3 4 5 6

中文翻译

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与DM74AS257相关器件

型号	品牌	获取价格	描述	数据表
DM74AS257_07	FAIRCHILD	获取价格	3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
DM74AS257J/A+	ETC	获取价格	2-Input Digital Multiplexer
DM74AS257M	FAIRCHILD	获取价格	3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
DM74AS257MX	FAIRCHILD	获取价格	2-Input Digital Multiplexer
DM74AS257N	FAIRCHILD	获取价格	3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
DM74AS257N/A+	ETC	获取价格	2-Input Digital Multiplexer
DM74AS257N/B+	ETC	获取价格	2-Input Digital Multiplexer
DM74AS257SJ	FAIRCHILD	获取价格	暂无描述
DM74AS257SJX	FAIRCHILD	获取价格	Multiplexer, AS Series, 4-Func, 2 Line Input, 1 Line Output, True Output, TTL, PDSO16, SOP
DM74AS258	FAIRCHILD	获取价格	3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

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