74LS251SC

更新时间： 2024-01-07 12:21:28

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	62K
描述
Multiplexer, 1-Func, 8 Line Input, TTL, PDSO16,

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技术参数
数据手册

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74LS251SC 技术参数

生命周期：	Contact Manufacturer	包装说明：	,
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.78	Is Samacsys：	N
逻辑集成电路类型：	MULTIPLEXER	Base Number Matches：	1

74LS251SC 数据手册

August 1986

Revised March 2000

DM74LS251

3-STATE 1-of-8 Line Data Selector/Multiplexer

General Description

Features

These data selectors/multiplexers contain full on-chip

binary decoding to select one-of-eight data sources, and

feature a strobe-controlled 3-STATE output. The strobe

must be at a low logic level to enable these devices. The 3-

STATE outputs permit direct connection to a common bus.

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

impedance state in which both the upper and lower transis-

tors of each totem-pole output are OFF, and the output nei-

ther drives nor loads the bus significantly. When the strobe

is LOW, the outputs are activated and operate as standard

TTL totem-pole outputs.

■ 3-STATE version of DM74LS151

■ 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

■ Maximum number of common outputs: 129

■ Typical propagation delay time (D to Y): 17 ns

■ Typical power dissipation: 35 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.

Ordering Code:

Order Number Package Number

Package Description

DM74LS251M

DM74LS251N

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

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

Connection Diagram

Function Table

Inputs

Outputs

Select

Strobe

H = HIGH Logic Level

L = LOW Logic Level

X = Don't Care

Z = High Impedance (OFF)

D0, D1…D7 = The level of the respective D input

DS006415

www.fairchildsemi.com

12 3 4 5 6

中文翻译

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与74LS251SC相关器件

型号	品牌	获取价格	描述	数据表
74LS253	FAIRCHILD	获取价格	3-STATE Data Selector/Multiplexer
74LS253B	NXP	获取价格	Multiplexer, LS Series, 2-Func, 4 Line Input, 1 Line Output, True Output, TTL, PDIP16,
74LS253DC	ETC	获取价格	4-Input Digital Multiplexer
74LS253DCQM	FAIRCHILD	获取价格	Multiplexer, 2-Func, 4 Line Input, TTL, CDIP16,
74LS253DCQR	ROCHESTER	获取价格	Multiplexer
74LS253PC	ROCHESTER	获取价格	Multiplexer
74LS253PCQM	ROCHESTER	获取价格	Multiplexer
74LS253SC	ETC	获取价格	4-Input Digital Multiplexer
74LS256DC	FAIRCHILD	获取价格	D Latch, 2-Func, 4-Bit, TTL, CDIP16,
74LS256DCQM	FAIRCHILD	获取价格	D Latch, 2-Func, 4-Bit, TTL, CDIP16,

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