DM74LS259N

8位可寻址锁存器 8-Bit Addressable Latches

General Description

These 8-bit addressable latches are designed for general purpose storage applications in digital systems. Specific

uses include working registers, serial-holding registers, and active-high decoders or demultiplexers. They are mul

tifunctional devices capable of storing single-line data in eight addressable latches, and being a 1-of-8 decoder or demultiplexer with active-high outputs.

Features

■8-Bit parallel-out storage register performs serial-to-parallel conversion with storage

■Asynchronous parallel clear

■Active high decoder

■Enable/disable input simplifies expansion

■Direct replacement for DM9334

■Expandable for N-bit applications

■Four distinct functional modes

■Typical propagation delay times:

    Enable-to-output 18 ns

    Data-to-output 16 ns

    Address-to-output  21 ns

    Clear-to-output  17 ns

■Fan-out

    IOL sink current 8 mA

    IOH source current −0.4 mA

■Typical ICC22 mA