Datasheet > DM74LS256N

DM74LS256N

更新时间： 2024-02-27 14:28:42

品牌	Logo	应用领域
美国国家半导体 - NSC		触发器锁存器逻辑集成电路光电二极管
页数	文件大小	规格书
6页	129K
描述
Dual 4-Bit Addressable Latch

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DM74LS256N 数据手册

June 1989

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).

could impose a transient wrong address. Therefore, this

should be done only while in the memory mode (E

HIGH).

Features

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-

Serial-to-parallel capability

Output from each storage bit available

Random (addressable) data entry

Easily expandable

Active low common clear

LOW, CL

erating in the addressable latch mode (E

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

Connection Diagram

Logic Symbol

Dual-In-Line Package

TL/F/9823–1

TL/F/9823–2

Order Number 54LS256DMQB,

54LS256FMQB or DM74LS256N

See NS Package Number J16A,

N16E or W16A

Pin 16

GND

Pin 8

Pin Names

A0, A1

Description

Common Address Inputs

Data Inputs

D , D

Common Enable Input (Active LOW)

Conditional Clear Input (Active LOW)

Side A Latch Outputs

Q0 –Q a

Q0 –Q b

b 3

Side B Latch Outputs

1995 National Semiconductor Corporation

TL/F/9823

RRD-B30M115/Printed in U. S. A.

12 3 4 5 6

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与DM74LS256N相关器件

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DM74LS257B	FAIRCHILD	获取价格	3-STATE Quad 2-Data Selectors/Multiplexers
DM74LS257BM	NSC	获取价格	TRI-STATE Quad 2-Data Selectors/Multiplexers
DM74LS257BM	FAIRCHILD	获取价格	3-STATE Quad 2-Data Selectors/Multiplexers
DM74LS257BMX	FAIRCHILD	获取价格	2-Input Digital Multiplexer
DM74LS257BN	FAIRCHILD	获取价格	3-STATE Quad 2-Data Selectors/Multiplexers
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