74HCT257

更新时间： 2024-11-20 06:31:55

品牌	Logo	应用领域
恩智浦 - NXP		复用器
页数	文件大小	规格书
17页	177K
描述
Quad 2-input multiplexer; 3-state

阅读下载

中文翻译

获取价格

如果您发现信息不准确，欢迎纠错

74HCT257 数据手册

74HC257; 74HCT257

Quad 2-input multiplexer; 3-state

Rev. 05 — 13 January 2010

Product data sheet

1. General description

The 74HC257; 74HCT257 are high-speed Si-gate CMOS devices and are pin compatible

with Low-power Schottky TTL (LSTTL).

The 74HC257 and 74HCT257 have four identical 2-input multiplexers with 3-state outputs,

which select 4 bits of data from two sources and are controlled by a common data select

input (S).

The data inputs from source 0 (1I0 to 4I0) are selected when input S is LOW and the data

inputs from source 1 (1I1 to 4I1) are selected when S is HIGH. Data appears at the

outputs (1Y to 4Y) in true (non-inverting) form from the selected inputs.

The 74HC257 and 74HCT257 are the logic implementation of a 4-pole, 2-position switch,

where the position of the switch is determined by the logic levels applied to S. The outputs

are forced to a high-impedance OFF-state when OE is HIGH.

The logic equations for the outputs are:

1Y = OE • (1I1 • S • 1I0 • S)

2Y = OE • (2I1 • S • 2I0 • S)

3Y = OE • (3I1 • S • 3I0 • S)

4Y = OE • (4I1 • S • 4I0 • S)

Except for their non-inverting (true) outputs the 74HC257; 74HCT257 are identical to the

74HC258.

2. Features

Non-inverting data path

3-state outputs interface directly with system bus

Complies with JEDEC standard no. 7A

ESD protection:

HBM JESD22-A114E exceeds 2000 V

MM JESD22-A115-A exceeds 200 V

Multiple package options

Specified from −40 °C to +85 °C and from −40 °C to +125 °C

12 3 4 5 6 7...17

中文翻译

下载PDF

型号	品牌	获取价格	描述	数据表
74HCT257D	NXP	获取价格	Quad 2-input multiplexer 3-state
74HCT257D	NEXPERIA	获取价格	Quad 2-input multiplexer; 3-stateProduction
74HCT257D,652	NXP	获取价格	74HC(T)257 - Quad 2-input multiplexer; 3-state SOP 16-Pin
74HCT257DB	NXP	获取价格	Quad 2-input multiplexer 3-state
74HCT257DB-T	NXP	获取价格	IC HCT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16, 5.30 MM, PLASTIC, M
74HCT257D-Q100	NEXPERIA	获取价格	Quad 2-input multiplexer; 3-state
74HCT257D-T	NXP	获取价格	IC HCT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDSO16, 3.90 MM, PLASTIC, M
74HCT257N	NXP	获取价格	Quad 2-input multiplexer 3-state
74HCT257N	PHILIPS	获取价格	Multiplexer, 4-Func, 2 Line Input, CMOS, PDIP16,
74HCT257NB	NXP	获取价格	HCT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16