MC74ACT259DR2

Latches Overview

The MC74ACT259DR2G is an 8-bit addressable latch from the 74ACT series, packaged in a 16-lead SOIC. It operates on a 4.5 V to 5.5 V supply with a typical quiescent current of 8 µA at 5.5 V. The device features active HIGH outputs and supports propagation delays up to 13.5 ns (Address to Qn) at 5.0 V. It includes an active LOW Master Reset and Enable inputs for mode selection.

Latches Feature Summary

• Provides eight individually addressable latches for random data entry and storage
• Functions as a 1-of-8 decoder or demultiplexer with active HIGH outputs
• Incorporates an active LOW Master Reset for clearing all latches simultaneously

Latches Applications

• Serial-to-parallel conversion circuits
• General-purpose digital system data storage
• Active high decoding applications

Latches Procurement Notes

Verify the complete part number includes the 'G' suffix for lead-free compliance. Confirm the package type matches the required SOIC-16 footprint. Ensure the operating voltage range aligns with the specified 4.5 V to 5.5 V limits for the ACT logic family.

Latches Selection Notes

Select this component when TTL-compatible inputs are required alongside AC speed performance. It serves as a functional equivalent to the ALS259. Consider the 24 mA output drive capability for direct bus interfacing needs without additional buffering.

Latches Part Context

This device belongs to the MC74AC/ACT259 family of high-speed addressable latches. It is designed for general-purpose storage in digital systems, offering multifunctional capabilities including memory storage and decoding within a single integrated circuit package.

Latches Replacement Considerations

MC74AC259DG

Latches FAQ

What are the four operational modes of the MC74ACT259?

The device supports Addressable Latch, Memory, Active HIGH Demultiplexer, and Clear modes, determined by the states of the Master Reset and Enable inputs.

How does the device handle address changes during operation?

When used as an addressable latch, changing more than one bit of the address may impose a transient wrong address; this should be done while in the memory mode.