MC74VHCT259ADTRG

Latches Overview

The MC74VHCT259ADTRG is an 8-bit addressable latch fabricated with silicon gate CMOS technology, housed in a TSSOP-16 package. It operates within a DC supply voltage range of 4.5 V to 5.5 V and supports an operating temperature range from -55°C to +125°C. The device features TTL-compatible inputs with a maximum quiescent supply current of 40 µA at 5.5 V. Propagation delays vary by input source: data-to-output delay is typically 6.0 ns at 5.0 V with 15 pF load; address-select-to-output delay is typically 6.0 ns (15 pF) or 8.5 ns (50 pF); enable-to-output delay is typically 6.0 ns (15 pF) or 8.5 ns (50 pF); and reset-to-output delay is typically 6.0 ns (15 pF) or 8.5 ns (50 pF).

Latches Feature Summary

• Provides four operational modes including addressable latch, memory, one-of-eight decoding, and reset.
• Features internal buffer output for high noise immunity and stable signal transmission.
• Includes power-down protection on inputs and outputs to prevent device destruction during voltage mismatches.
• Offers ESD performance exceeding 2000 V under the Human Body Model standard.

Latches Applications

• General purpose storage applications in digital systems
• Level conversion for interfacing 3.3 V logic to 5.0 V CMOS levels
• Addressable data latching and demultiplexing

Latches Procurement Notes

Verify component status before procurement as the MC74VHCT259ADTRG is officially marked as discontinued in the datasheet revision history dated August 5, 2026. Confirm availability through authorized representatives and ensure replacement strategies are in place for ongoing production requirements.

Latches Selection Notes

Select this component for designs requiring 8-bit addressable latching with LSTTL-compatible inputs and wide industrial temperature ranges. Ensure the application utilizes the recommended 4.5 V to 5.5 V supply voltage. Note that changing more than one bit of the address should be performed only while the device is in memory mode to avoid transient wrong addresses.

Latches Part Context

This device belongs to the VHCT logic family, combining high-speed CMOS operation with low power dissipation similar to Bipolar Schottky TTL. It is functionally compatible with other standard logic families but offers enhanced noise immunity and power-down protection characteristics specific to the VHCT architecture.

Latches Replacement Considerations

Consult onsemi representatives for current alternatives due to discontinuation status. Cross-reference with MC74VHCT259ADR2G (SOIC-16) or MC74VHCT259ADG (SOIC-16 tube) if package compatibility allows, though these are also listed as discontinued in the provided documentation.

Latches FAQ

How does the device handle address changes during operation?

Changing more than one bit of the address can impose a transient wrong address. This operation should only be performed while the device is in memory mode to prevent unintended state changes.

What is the input voltage compatibility of the VHCT259A?

The VHCT inputs are compatible with TTL levels, specifically VIL = 0.8 V and VIH = 2.0 V, allowing it to interface with LSTTL logic standards.