74HCT259-Q100 datasheet(1/20 Pages) NXP

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1.

General description

The 74HC259-Q100; 74HCT259-Q100 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. 7A.

The 74HC259-Q100; 74HCT259-Q100 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 and

providing 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-Q100; 74HCT259-Q100 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-Q100; 74HCT259-Q100 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.

This product has been qualified to the Automotive Electronics Council (AEC) standard

Q100 (Grade 1) and is suitable for use in automotive applications.

2.

Features and benefits

 Automotive product qualification in accordance with AEC-Q100 (Grade 1)

 Specified from

40 C to +85 C and from 40 C to +125 C

 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

74HC259-Q100; 74HCT259-Q100

8-bit addressable latch

Rev. 1 — 30 July 2012

Product data sheet

Podobny numer części - 74HCT259-Q100

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