Datasheet > 74ACT257LC

74ACT257LC

更新时间： 2024-09-14 08:15:07

品牌	Logo	应用领域
美国国家半导体 - NSC		输出元件
页数	文件大小	规格书
10页	168K
描述
IC ACT SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, CQCC20, CERAMIC, LCC-20, Multiplexer/Demultiplexer

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74ACT257LC 数据手册

March 1993

54AC/74AC257 54ACT/74ACT257

Quad 2-Input Multiplexer with TRI-STATE Outputs

General Description

The ’AC/’ACT257 is

Features

and I

reduced by 50%

a quad 2-input multiplexer with

TRI-STATE outputs. Four bits of data from two sources can

be selected using a Common Data Select input. The four

outputs present the selected data in true (noninverted) form.

The outputs may be switched to a high impedance state by

placing a logic HIGH on the common Output Enable (OE)

input, allowing the outputs to interface directly with bus-ori-

ented systems.

Multiplexer expansion by tying outputs together

Noninverting TRI-STATE outputs

Outputs source/sink 24 mA

’ACT257 has TTL-compatible inputs

Standard Military Drawing (SMD)

Ð ’AC257: 5962-88703

Ð ’ACT257: 5962-89689

Logic Symbols

Connection Diagrams

Pin Assignment

for DIP, Flatpak and SOIC

IEEE/IEC

TL/F/9949–1

TL/F/9949–3

Pin Assignment

for LCC

TL/F/9949–2

Pin Names

Description

Common Data Select Input

TRI-STATE Output Enable Input

Data Inputs from Source 0

Data Inputs from Source 1

TRI-STATE Multiplexer Outputs

–I

0a 0d

–I

1a 1d

Z –Z

TL/F/9949–4

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

FACT^TMis a trademark of National Semiconductor Corporation.

1995 National Semiconductor Corporation

TL/F/9949

RRD-B30M75/Printed in U. S. A.

12 3 4 5 6 7...10

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