dm74ls258b National Semiconductor Corporation, dm74ls258b Datasheet

dm74ls258b

Manufacturer Part Number

dm74ls258b

Description

Manufacturer

National Semiconductor Corporation

Datasheet

1.DM74LS258B.pdf (8 pages)

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C 1995 National Semiconductor Corporation

54LS257A DM54LS257B DM74LS257B

54LS258A DM54LS258B DM74LS258B

TRI-STATE Quad 2-Data Selectors Multiplexers

General Description

These Schottky-clamped high-performance multiplexers

feature TRI-STATE outputs that can interface directly with

data lines of bus-organized systems With all but one of the

common outputs disabled (at a high impedance state) the

low impedance of the single enabled output will drive the

bus line to a high or low logic level To minimize the possibil-

ity that two outputs will attempt to take a common bus to

opposite logic levels the output enable circuitry is designed

such that the output disable times are shorter than the out-

put enable times

This TRI-STATE output feature means that n-bit (paralleled)

data selectors with up to 258 sources can be implemented

for data buses It also permits the use of standard TTL reg-

isters for data retention throughout the system

Connection Diagrams

Function Table

TRI-STATE is a registered trademark of National Semiconductor Corporation

Order Number 54LS257ADMQB 54LS257AFMQB

54LS257ALMQB DM54LS257BJ DM54LS257BW

See NS Package Number E20A J16A

DM74LS257BM or DM74LS257BN

Dual-In-Line Package

M16A N16E or W16A

TL F 6417

Control

Output

High Impedance (off)

High Level L

Inputs

TL F 6417 – 1

Select

Low Level X

Features

TRI-STATE versions LS157 and LS158 with same pin-

outs

Schottky-clamped for significant improvement in A-C

performance

Provides bus interface from multiple sources in high-

performance systems

Average propagation delay from data input 12 ns

Typical power dissipation

Alternate

54LS258A) are available Contact a National Semicon-

ductor Sales Office Distributor for specifications

Order Number 54LS258ADMQB 54LS258AFMQB

54LS258ALMQB DM54LS258BJ DM54LS258BW

LS257

LS257B 50 mW

LS258B 35 mW

Output Y

Don’t Care

See NS Package Number E20A J16A

DM74LS258BM or DM74LS258BN

LS258

military aerospace

Dual-In-Line Package

M16A N16E or W16A

devices

RRD-B30M105 Printed in U S A

(54LS257A

June 1989

TL F 6417 – 2

Related parts for dm74ls258b

dm74ls258b Summary of contents

Page 1

... Y 54LS258A) are available Contact a National Semicon- ductor Sales Office Distributor for specifications Dual-In-Line Package TL F 6417 – 1 Order Number 54LS258ADMQB 54LS258AFMQB 54LS258ALMQB DM54LS258BJ DM54LS258BW DM74LS258BM or DM74LS258BN See NS Package Number E20A J16A M16A N16E or W16A Inputs Output Y Select A B LS257 ...

Page 2

Absolute Maximum Ratings If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications Supply Voltage Input Voltage Operating Free Air Temperature Range DM54LS and 54LS b DM74LS Storage Temperature Range b ...

Page 3

... Other 3 667 150 pF Units e L Min Max DM74LS258B Units Min Nom Max Typ Max Units (Note ...

Page 4

Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted) (Continued) Symbol Parameter I Low Level Input IL Current I Off-State Output Current OZH with High Level Output Voltage Applied I Off-State Output Current OZL with Low ...

Page 5

Logic Diagrams LS257B TL F 6417 – 3 LS258B TL F 6417 – ...

Page 6

Physical Dimensions inches (millimeters) Ceramic Leadless Chip Carrier Package (E) Order Number 54LS257ALMQB or 54LS258ALMQB 16-Lead Ceramic Dual-In-Line Package (J) Order Number 54LS257ADMQB 54LS258ADMQB DM54LS257BJ or DM54LS258BJ NS Package Number E20A NS Package Number J16A 6 ...

Page 7

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS257BM or DM74LS258BM 16-Lead Molded Dual-In-Line Package (N) Order Number DM74LS257BN or DM74LS258BN NS Package Number M16A NS Package Number N16E 7 ...

Page 8

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) Order Number 54LS257AFMQB or 54LS258AFMQB LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF ...

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