dm74ls256 National Semiconductor Corporation, dm74ls256 Datasheet

dm74ls256

Manufacturer Part Number

dm74ls256

Description

Dual 4-bit Addressable Latch

Manufacturer

National Semiconductor Corporation

Datasheet

1.DM74LS256.pdf (6 pages)

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C 1995 National Semiconductor Corporation

54LS256 DM74LS256

Dual 4-Bit Addressable Latch

General Description

The ’LS256 is a dual 4-bit addressable latch with common

control inputs these include two Address inputs (A0 A1)

an active LOW enable input (E) and an active LOW Clear

input (CL) Each latch has a Data input (D) and four outputs

(Q0 – Q3)

When the Enable (E) is HIGH and the Clear input (CL) is

LOW all outputs (Q0 – Q3) are LOW Dual 4-channel demul-

tiplexing occurs when the CL and E are both LOW When

CL is HIGH and E is LOW the selected output (Q0 – Q3)

determined by the Address inputs follows D When the E

goes HIGH the contents of the latch are stored When op-

erating in the addressable latch mode (E

HIGH) changing more than one bit of the Address (A0 A1)

Connection Diagram

54LS256FMQB or DM74LS256N

See NS Package Number J16A

Order Number 54LS256DMQB

Dual-In-Line Package

N16E or W16A

TL F 9823 – 1

TL F 9823

Pin Names

A0 A1

– Q

Logic Symbol

LOW CL

Common Address Inputs

Data Inputs

Common Enable Input (Active LOW)

Conditional Clear Input (Active LOW)

Side A Latch Outputs

Side B Latch Outputs

could impose a transient wrong address Therefore this

should be done only while in the memory mode (E

HIGH)

Features

Description

Serial-to-parallel capability

Output from each storage bit available

Random (addressable) data entry

Easily expandable

Active low common clear

GND

Pin 16

Pin 8

RRD-B30M115 Printed in U S A

June 1989

TL F 9823 – 2

Related parts for dm74ls256

dm74ls256 Summary of contents

Page 1

... HIGH the contents of the latch are stored When op- erating in the addressable latch mode (E HIGH) changing more than one bit of the Address (A0 A1) Connection Diagram Dual-In-Line Package TL F 9823 – 1 Order Number 54LS256DMQB 54LS256FMQB or DM74LS256N See NS Package Number J16A N16E or W16A Pin Names ...

Page 2

Truth Table Inputs ...

Page 3

... Inputs Max Inputs Max Inputs Max 54LS DM74 b Max DM74LS256 Units Min Nom Max Typ ...

Page 4

Switching Characteristics (See Section 1 for waveforms and load configurations Symbol Parameter t Propagation Delay PLH PHL t Propagation Delay PLH ...

Page 5

... Physical Dimensions inches (millimeters) 16-Lead Ceramic Dual-In-Line Package (J) 16-Lead Molded Dual-In-Line Package (N) Order Number 54LS256DMQB NS Package Number J16A Order Number DM74LS256N 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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