DM74S251J

更新时间： 2024-11-29 13:07:23

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
6页	118K
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数据手册

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DM74S251J 数据手册

June 1989

DM54S251/DM74S251 TRI-STATE 1 of 8 Line

Data Selector/Multiplexer

General Description

Features

TRI-STATE version of S151

These data selectors/multiplexers contain full on-chip bina-

ry decoding to select one-of-eight data sources, and feature

a strobe-controlled TRI-STATE output. The strobe must be

at a low logic level to enable these devices. The TRI-STATE

outputs permit direct connection to a common bus. When

the strobe input is high, both outputs are in a high-imped-

ance state in which both the upper and lower transistors of

each totem pole output are off, and the output neither drives

nor loads the bus significantly. When the strobe is low, the

outputs are activated and operate as standard TTL totem-

pole outputs.

Interface directly with system bus

Perform parallel-to-serial conversion

Permit multiplexing from N-lines to one line

Complementary outputs provide true and inverted data

Max no. of common outputs

54S 39

74S 129

Typical propagation delay time (D to Y) 8 ns

Typical power dissipation 275 mW

To minimize the possibility that two outputs will attempt to

take a common bus to opposite logic levels, the output con-

trol circuitry is designed so that the average output disable

time is shorter than the average output enable time.

Connection Diagram

Function Table

Inputs

Select

Outputs

Strobe

Low Logic Level

High Logic Level, L

High Impedance (Off)

Don’t Care, Z

D0, D1 . . . D7

The Level of the respective D input

TL/F/6480–1

Order Number DM54S251J or DM74S251N

See NS Package Number J16A or N16E

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

1995 National Semiconductor Corporation

TL/F/6480

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

12 3 4 5 6

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与DM74S251J相关器件

型号	品牌	获取价格	描述	数据表
DM74S251J/A+	ETC	获取价格	8-Input Digital Multiplexer
DM74S251N	NSC	获取价格	IC S SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDIP16, PLASTIC, DIP-16,
DM74S251N	TI	获取价格	S SERIES, 8 LINE TO 1 LINE MULTIPLEXER, COMPLEMENTARY OUTPUT, PDIP16, PLASTIC, DIP-16
DM74S251N/A+	ETC	获取价格	8-Input Digital Multiplexer
DM74S251N/B+	ETC	获取价格	8-Input Digital Multiplexer
DM74S253	FAIRCHILD	获取价格	Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer
DM74S253J/A+	ETC	获取价格	4-Input Digital Multiplexer
DM74S253N	FAIRCHILD	获取价格	Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer
DM74S253N/A+	ETC	获取价格	4-Input Digital Multiplexer
DM74S253N/B+	ETC	获取价格	4-Input Digital Multiplexer