TC74VHC373FT(EL,M)

Overview

The TC74VHC373FT(EL,M) is an octal D-type latch with 3-state outputs manufactured using Toshiba's advanced high-speed 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, low quiescent current (max 4 μA at 25°C), and input protection allowing 0 to 5.5 V application regardless of supply voltage. Typical propagation delay is 5.0 ns at 5 V, with maximums reaching 17.0 ns under specific load conditions.

Feature Summary

• Octal D-type latch architecture with tri-state output control via OE and LE inputs
• High noise immunity and power-down protection on all inputs
• Input voltage tolerance up to 5.5 V for interfacing between different logic families
• Balanced propagation delays ensuring consistent signal timing

Applications

• Interfacing 5 V systems to 3 V systems
• Battery backup system interfaces
• Data storage and buffering in digital circuits
• Bus driver applications requiring tri-state isolation

Procurement Notes

Verify the exact package suffix against the datasheet: 'F' denotes SOP-20, 'FT' denotes TSSOP-20, and 'FK' denotes VSSOP-20. Confirm RoHS compliance status directly with the manufacturer or authorized distributors as environmental declarations may vary by production batch. Ensure the ordering code matches the required physical footprint and pin pitch for PCB layout compatibility.

Selection Notes

Select this component when an octal latch with tri-state capability is required for high-speed CMOS applications. It serves as a functional equivalent to the 74ALS373 while offering lower power consumption. Consider the specific package type (SOP, TSSOP, or VSSOP) based on board space constraints and thermal requirements. Verify that the 2.0 V to 5.5 V operating range aligns with the target system's supply voltage.

Part Context

This part belongs to the TC74VHC series of advanced high-speed CMOS logic devices produced by Toshiba Semiconductor and Storage. The VHC series is designed to provide performance comparable to Bipolar Schottky TTL but with significantly reduced power dissipation. The 373 variant specifically implements an octal transparent latch configuration, widely used in microprocessor-based systems for address and data latching.

Replacement Considerations

The datasheet explicitly states pin and function compatibility with the 74ALS373. Designers replacing legacy 74ALS373 components should verify that the higher input capacitance and different drive strengths of the VHC series do not impact signal integrity in existing designs.