74HC259D,652

Latches Overview

The Nexperia 74HC259D,652 is an 8-bit addressable latch in a 16-lead SO plastic small outline package (SOT109-1). It operates on a single supply voltage ranging from 2.0 V to 6.0 V and supports ambient temperatures from -40 °C to +125 °C. The device features four modes: addressable latch, memory, demultiplexer, and reset. Inputs include clamp diodes for interfacing with voltages exceeding VCC. Static characteristics specify input leakage current up to ±1 μA at 6.0 V and supply current up to 160 μA. Dynamic propagation delay from data or address inputs to outputs reaches a maximum of 56 ns at 4.5 V.

Latches Feature Summary

• Supports serial-to-parallel conversion and random addressable data entry across eight storage bits.
• Functions as a combined demultiplexer and decoder with active HIGH output selection.
• Includes common reset input and latch enable control for flexible state management.
• Provides ESD protection compliant with ANSI/ESDA/JEDEC standards.

Latches Applications

• Serial-to-parallel data conversion circuits
• Addressable memory latching systems
• 3-to-8 channel decoding applications

Latches Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and temperature range. Confirm RoHS compliance status and lead-free designation prior to integration. Ensure design margins align with absolute maximum ratings to prevent permanent damage during operation.

Latches Selection Notes

Select this component when an 8-bit addressable latch or demultiplexer is required within standard CMOS logic families. Verify that the operating voltage falls between 2.0 V and 6.0 V. Consider the SO16 package dimensions for PCB layout constraints. Evaluate propagation delays against system timing requirements at the target supply voltage.

Latches Part Context

This part belongs to the 74HC/HCT logic family, designed for general-purpose digital applications. It provides high noise immunity and low power consumption typical of CMOS technology. The device integrates eight independent latches controlled by three address lines and a data input, enabling complex sequential logic implementations.

Latches Replacement Considerations

Check for equivalent parts such as the 74HCT259 variant if TTL-level input compatibility is required instead of CMOS levels. Verify pinout and functional equivalence before substitution.

Latches FAQ

What are the four operating modes of the 74HC259?

The device supports addressable latch mode, memory mode, demultiplexer mode, and reset mode, selected via the Master Reset (MR) and Latch Enable (LE) inputs.

How does the device handle input voltages exceeding VCC?

Inputs include clamp diodes, which allow the use of current-limiting resistors to interface inputs to voltages higher than the supply voltage without damaging the device.