dm74ls251 National Semiconductor Corporation, dm74ls251 Datasheet

dm74ls251

Manufacturer Part Number

dm74ls251

Description

Tri-state Data Selectors/multiplexers

Manufacturer

National Semiconductor Corporation

Datasheet

1.DM74LS251.pdf (6 pages)

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C 1995 National Semiconductor Corporation

DM54LS251 DM74LS251

TRI-STATE Data Selectors Multiplexers

General Description

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

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

TRI-STATE is a registered trademark of National Semiconductor Corporation

See NS Package Number J16A M16A N16E or W16A

Order Number DM54LS251J DM54LS251W

DM74LS251M or DM74LS251N

Dual-In-Line Package

TL F 6415

TL F 6415 – 1

Features

Function Table

D0 D1

54LS 49

74LS 129

54LS 17 ns

74LS 17 ns

54LS 35 mW

74LS 35 mW

TRI-STATE version of LS151

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

Typical propagation delay time (D to Y)

Typical power dissipation

Don’t Care Z

High Logic Level L

Select

The level of the respective D input

Inputs

High Impedance (Off)

Low Logic Level

Strobe

RRD-B30M105 Printed in U S A

Outputs

June 1989

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dm74ls251 Summary of contents

Page 1

... Connection Diagram Dual-In-Line Package Order Number DM54LS251J DM54LS251W DM74LS251M or DM74LS251N See NS Package Number J16A M16A N16E or W16A TRI-STATE is a registered trademark of National Semiconductor Corporation C 1995 National Semiconductor Corporation TL F 6415 ...

Page 2

... Min V Max Max DM54 (Note 2) DM74 b V Max (Note Max (Note DM74LS251 Units Min Nom Max Typ Max Units (Note ...

Page 3

Switching Characteristics Symbol Parameter t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High to Low Level Output t Propagation Delay Time PLH Low to High Level Output t Propagation Delay Time PHL High ...

Page 4

Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) Order Number DM54LS251J NS Package Number J16A 4 ...

Page 5

... Physical Dimensions inches (millimeters) (Continued) 16-Lead Small Outline Molded Package (M) Order Number DM74LS251M NS Package Number M16A Molded Dual-In-Line Package (N) Order Number DM74LS251N NS Package Number N16E 5 ...

Page 6

Physical Dimensions inches (millimeters) (Continued) 16-Lead Ceramic Flat Package (W) 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 THE PRESIDENT OF NATIONAL SEMICONDUCTOR ...

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