Datasheet > 74HC259D.653

74HC259D.653

更新时间： 2022-04-12 02:39:06

品牌	Logo	应用领域
恩智浦 - NXP		锁存器
页数	文件大小	规格书
23页	174K
描述
8-bit addressable latch

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数据手册

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74HC259D.653 数据手册

74HC259; 74HCT259

8-bit addressable latch

Rev. 5 — 7 August 2012

Product data sheet

1. General description

The 74HC259; 74HCT259 are high-speed Si-gate CMOS devices and are pin compatible

with Low-power Schottky TTL (LSTTL). They are specified in compliance with JEDEC

standard No. 7-A.

The 74HC259; 74HCT259 are high-speed 8-bit addressable latches designed for

general-purpose storage applications in digital systems. They are multifunctional devices

capable of storing single-line data in eight addressable latches. They provide a 3-to-8

decoder and multiplexer function with active HIGH outputs (Q0 to Q7). They also

incorporate an active LOW common reset (MR) for resetting all latches as well as an

active LOW enable input (LE).

The 74HC259; 74HCT259 has four modes of operation:

• Addressable latch mode, in this mode data on the data line (D) is written into the

addressed latch. The addressed latch follows the data input with all non-addressed

latches remaining in their previous states.

• Memory mode, in this mode all latches remain in their previous states and are

unaffected by the data or address inputs.

• Demultiplexing mode (or 3-to-8 decoding), in this mode the addressed output follows

the state of the data input (D) with all other outputs in the LOW state.

• Reset mode, in this mode all outputs are LOW and unaffected by the address inputs

(A0 to A2) and data input (D).

When operating the 74HC259; 74HCT259 as an address latch, changing more than one

address bit could impose a transient wrong address. Therefore, this should only be done

while in the Memory mode.

2. Features and benefits

 Combined demultiplexer and 8-bit latch

 Serial-to-parallel capability

 Output from each storage bit available

 Random (addressable) data entry

 Easily expandable

 Common reset input

 Useful as a 3-to-8 active HIGH decoder

 Input levels:

 For 74HC259: CMOS level

 For 74HCT259: TTL level

12 3 4 5 6 7...23

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