Datasheet > DM74AS257_07

DM74AS257_07

更新时间： 2024-09-30 04:53:59

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		复用器
页数	文件大小	规格书
8页	287K
描述
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers

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DM74AS257_07 数据手册

May 2007

DM74AS257, DM74AS258

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

Features

General Description

■ Switching specifications at 50pF

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 propa-

gation delay time.

■ Switching specifications guaranteed over full

temperature and V range

■ 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 (paral-

leled) data selectors with up to 300 sources can be

implemented for data buses. It also permits the use of

standard TTL registers for data retention throughout the

system.

■ Improved AC performance over Schottky, low power

Schottky, and advanced low power Schottky

counterparts

■ 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 Information

Order

Number

Package

Number

Package Description

DM74AS257M

DM74AS257N

DM74AS258M

M16A

N16E

M16A

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

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

DM74AS257, DM74AS258 Rev. 1.2

www.fairchildsemi.com

12 3 4 5 6 7 8

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与DM74AS257_07相关器件

型号	品牌	获取价格	描述	数据表
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
DM74AS258J/A+	ETC	获取价格	8-Input Digital Multiplexer