TC74VHC373FK(EL,K)

Overview

The TC74VHC373FK is an octal D-type latch with 3-state outputs manufactured using Toshiba's silicon gate C2MOS technology. It operates within a supply voltage range of 2.0 V to 5.5 V and supports an operating temperature from -40°C to 85°C. The device features balanced propagation delays, achieving typical speeds of 5.0 ns at 5 V. It includes power-down protection on all inputs and maintains high noise immunity.

Feature Summary

• Octal D-type transparent latch architecture with tri-state output capability controlled by separate Latch Enable (LE) and Output Enable (OE) signals.
• Advanced C2MOS fabrication ensures high-speed operation comparable to Bipolar Schottky TTL while maintaining low CMOS power dissipation.
• Integrated input protection circuits allow safe interfacing between 5 V and 3 V systems without risk of device destruction due to voltage mismatches.
• Pin and function compatibility with the 74ALS373 standard facilitates direct replacement in existing designs.

Applications

• Registering data in high-speed digital logic circuits
• Interfacing between 5 V and 3 V system domains
• Bus driver applications requiring tri-state isolation

Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the 'F' variant denotes SOP-20 packaging while other suffixes may indicate different form factors. Confirm RoHS compliance status directly with the manufacturer or authorized distributor, as environmental declarations can vary by production batch and region. Ensure the design accounts for the specified absolute maximum ratings to prevent reliability degradation.

Selection Notes

Select this component when a design requires an octal latch with tri-state outputs and pin compatibility with legacy 74ALS373 devices. It is suitable for applications demanding high-speed performance with low power consumption across a wide voltage range. Consider the specific package weight and dimensions if thermal management or board space is constrained.

Part Context

This part belongs to the TC74VHC series of advanced high-speed CMOS logic devices produced by Toshiba Electronic Devices & Storage Corporation. The VHC series is designed to offer performance levels similar to older bipolar technologies while retaining the benefits of modern CMOS fabrication.

Replacement Considerations

The datasheet explicitly states pin and function compatibility with the 74ALS373. Designers replacing older components should verify that the new supply voltage ranges and noise immunity characteristics align with the system requirements.

FAQ

How does the device handle input voltages relative to the supply voltage?

An input protection circuit allows 0 to 5.5 V to be applied to the input pins regardless of the supply voltage, preventing device destruction during mismatched supply conditions.

What is the mechanism for controlling the output state?

The outputs are controlled by two inputs: the Latch Enable (LE) determines when data is latched, and the Output Enable (OE) controls the tri-state condition. When OE is high, the outputs enter a high-impedance state.