Rev.2.00, Feb.18.2005, page 1 of 7

HD74LS259

8-bit Address Latch

REJ03D0471–0200

Rev.2.00

Feb.18.2005

This 8-bit addressable latch is designed for general purpose storage applications in digital systems. Specific uses

include working registers, serial-holding registers, and active-high decoders or demultiplexers. This is multifunctional

device capable of storing single-line data in eight addressable latches, and being a 1-to-8 decoder or demultiplexer with

active-high outputs.

Four distinct modes of operation are selectable by controlling the clear and enable inputs as enumerated in the function

table. In the addressable-latch mode, data at the data-in terminal is written into the addressed latch.

The addressed latch will follow the data input with all unaddressed latches remaining in their previous states. In the

memory mode, latch remains in their previous states and is unaffected by the data or address inputs.

To eliminate the possibility of entering erroneous data in the latch, the enable should be held high (inactive) while the

address lines are changing.

In the clear mode, all outputs are low and unaffected by the address and data inputs.

Features

• Ordering Information

Part Name

Package Type

Package Code

(Previous Code)

Package

Abbreviation

Taping Abbreviation

(Quantity)

HD74LS259P

DILP-16 pin

PRDP0016AE-B

(DP-16FV)

—

—

HD74LS259FPEL

SOP-16 pin (JEITA)

PRSP0016DH-B

(FP-16DAV)

FP

EL (2,000 pcs/reel)

HD74LS259RPEL

SOP-16 pin (JEDEC)

PRSP0016DG-A

(FP-16DNV)

RP

EL (2,500 pcs/reel)

Note:

Please consult the sales office for the above package availability.