MC74ACT259NG

Latches Overview

The MC74ACT259NG is an 8-bit addressable latch manufactured by onsemi in the 74ACT logic series. It operates within a supply voltage range of 4.5 V to 5.5 V and supports a low-level output current of 24 mA and a high-level output current of -24 mA. The device features propagation delays with maximum values of 12.0 ns from data/address inputs to outputs, and 14.0 ns from the Enable input to outputs at 5.0 V. It utilizes a PDIP-16 package and functions across an ambient temperature range of -40°C to +85°C.

Latches Feature Summary

• Provides eight individually addressable storage latches for random data entry
• Functions as a 1-of-8 decoder or demultiplexer with active HIGH outputs
• Includes common clear and enable controls for system synchronization

Latches Applications

• Serial-to-parallel conversion circuits
• General-purpose digital storage applications
• Active high demultiplexing systems

Latches Procurement Notes

Verify that the ordering suffix 'N' corresponds to the PDIP-16 package configuration. Confirm the presence of the 'G' suffix if lead-free compliance is required for the specific procurement order. Ensure the component meets the specified operating temperature range for the intended environment.

Latches Selection Notes

Select this component when an 8-bit addressable latch or demultiplexer is required within a 5V logic system. The ACT series offers higher speed performance compared to standard HC logic while maintaining TTL-compatible input thresholds. Verify that the PDIP-16 through-hole package aligns with the target PCB layout requirements.

Latches Part Context

This part belongs to the MC74AC/ACT259 family of 8-bit addressable latches. It is functionally identical to the ALS259 device but utilizes CMOS technology. The family provides 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 (MR) and Enable (E) inputs.

How does the device handle unaddressed latches during operation?

In Addressable Latch mode, non-addressed latches remain in their previous states. In Demultiplexer mode, all unaddressed outputs remain in the LOW state.