TC74VHC393FT(EL,M)

Overview

The TC74VHC393FT(EL,M) is a dual 4-bit binary counter from Toshiba's 74VHC series, fabricated using silicon gate C2MOS technology. It integrates two independent counters within a single package to achieve counting or frequency division of eight bits. The device operates on negative-going clock transitions and features an asynchronous clear input that resets outputs to low regardless of other states. It supports a supply voltage range of 2.0 V to 5.5 V and includes input protection circuits allowing 0 to 5.5 V application without regard to supply voltage.

Feature Summary

• High-speed operation with maximum clock frequency reaching 170 MHz at 5 V supply
• Low power dissipation with quiescent current limited to 4 μA maximum at 25°C
• High noise immunity with minimum noise margins defined as 28% of VCC
• Power-down protection provided on all inputs to prevent device destruction

Applications

• Counting applications requiring dual independent 4-bit binary counters
• Frequency division circuits utilizing the cascaded counter stages
• Interface solutions between 5 V and 3 V systems
• Battery backup systems requiring dual supply compatibility

Procurement Notes

Verify the specific ordering suffix corresponds to the TSSOP-14 package type required for your design. Confirm RoHS compliance status directly with the manufacturer or authorized distributor, as regulatory status can vary by production batch. Ensure the component meets the intended operating temperature range of -40°C to 85°C for your specific environmental conditions before finalizing procurement.

Selection Notes

Select this component when high-speed performance comparable to Bipolar Schottky TTL is needed alongside CMOS low power consumption. The wide operating voltage range makes it suitable for interfacing different logic levels. Consider the TSSOP-14 package dimensions if space constraints are critical. Verify that the asynchronous clear functionality aligns with your system reset requirements.

Part Context

This part belongs to the TC74VHC393 family, which includes variants in SOP and SOL packages. The FT suffix specifically denotes the TSSOP-14 package configuration. The device is functionally compatible with the 74ALS393 standard, facilitating direct replacement in existing designs. It represents an advanced high-speed CMOS solution for general digital counting tasks.

Replacement Considerations

Direct functional substitutes include the 74ALS393 due to pin and function compatibility. Other 74VHC series counters may serve as alternatives if specific timing characteristics differ. Verify package dimensions and lead pitch when replacing with non-Toshiba equivalents to ensure mechanical fit.