QS74FCT521BTS0

Comparators Overview

The QS74FCT521BTS0 is an 8-bit identity comparator from the FCT series manufactured by Quality Semiconductor. It features active low outputs that indicate when input A equals input B. The device operates on a 5V supply with a voltage range of 4.75V to 5.25V. It utilizes CMOS technology and is housed in a TSOP-20 package. Key electrical characteristics include a maximum propagation delay of 7.2 ns and a maximum supply current of 4.5 mA. It supports operating temperatures from -40°C to +85°C.

Comparators Feature Summary

• Provides 8-bit identity comparison functionality
• Features active low output signals for equality detection
• Utilizes FCT CMOS technology for high-speed performance

Comparators Applications

• Digital data path validation
• Memory address matching circuits
• System configuration verification

Comparators Procurement Notes

Verify the manufacturer designation as Quality Semiconductor or its successor entities, as corporate structures may have changed. Confirm the package type is TSOP-20 and check RoHS compliance status against specific revision codes. Ensure the operating temperature range meets industrial requirements if deployed in harsh environments. Cross-reference datasheet revisions to confirm pinout consistency.

Comparators Selection Notes

Select this component when an 8-bit equality check is required within a 5V logic system. The FCT series offers faster switching speeds compared to standard 74LS equivalents. Consider the TSOP-20 surface mount package for compact PCB layouts. Evaluate the 7.2 ns propagation delay against system timing constraints to ensure signal integrity at target clock frequencies.

Comparators Part Context

This part belongs to the FCT (Fast CMOS Technology) family, designed for high-speed digital applications. It serves as a direct replacement for older bipolar logic families while offering lower power consumption. The identity comparator function is essential for verifying data integrity in parallel buses and control lines within embedded systems.

Comparators Replacement Considerations

The QS74FCT521ATQG is a documented equivalent from Renesas Electronics offering identical 8-bit identity comparison functionality. Verify pin compatibility and electrical specifications before substitution. Other FCT-series comparators may require logic level adjustments.