74HCT259D,652

Latches Overview

The Nexperia 74HCT259D,652 is an 8-bit addressable latch in the HCT logic family. It operates within a supply voltage range of 4.5 V to 5.5 V and accepts TTL-level inputs. The device features four modes: addressable latch, memory, demultiplexer, and reset. It utilizes three address inputs (A0-A2) and one data input (D). Outputs are available for each storage bit. The component is housed in a 16-lead SOIC package (SOT109-1) with an operating temperature range from -40 °C to +125 °C.

Latches Feature Summary

• Supports four distinct operational modes including addressable latch, memory retention, demultiplexing, and conditional reset.
• Provides individual access to all eight storage bits via dedicated outputs.
• Features clamp diodes on inputs to allow interfacing with voltages exceeding VCC using current limiting resistors.
• Includes ESD protection compliant with ANSI/ESDA/JEDEC standards.

Latches Applications

• Serial-to-parallel data conversion
• 3-to-8 active HIGH decoding
• Random addressable data entry systems

Latches Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact package type and temperature rating. Confirm that the required logic family variant matches the application voltage requirements. Check for any recent product change notices or end-of-life announcements directly from the supplier before finalizing procurement plans.

Latches Selection Notes

Select this component when TTL-compatible logic levels are required for control signals while maintaining CMOS performance characteristics. Ensure the design accommodates the specified supply voltage limits and thermal dissipation requirements for the SOIC package. Verify that the pinout configuration aligns with the intended PCB layout constraints.

Latches Part Context

This part belongs to the 74HCT series of integrated circuits manufactured by Nexperia. It is functionally compatible with other devices in the same logic family but offers specific addressing capabilities not found in standard latches or decoders. The D suffix indicates the plastic small outline package variant.

Latches Replacement Considerations

The 74HCT259PW serves as a direct functional substitute utilizing a TSSOP package. Other variants within the 74HCT259 family may be considered if package flexibility is required, provided the electrical specifications remain consistent with the system design.

Latches FAQ

How does the device handle data when in memory mode?

In memory mode, all latches retain their previous states and remain unaffected by changes to the data or address inputs.

What is the function of the MR input?

The MR input acts as a conditional reset input. When driven LOW, it forces all outputs to a LOW state regardless of other inputs.