74FCT521ATQG8

Overview

The 74FCT521ATQG8 is an 8-bit identity comparator from the Renesas 74FCT logic family, housed in a QSOP-20 package. It operates within a supply voltage range of 4.75 V to 5.25 V, with a maximum power consumption of 4.5 mA. The device features active-low outputs indicating equality between inputs A and B. Propagation delays are specified at 6 ns and 7.2 ns. It functions reliably across temperatures from -40°C to +85°C.

Feature Summary

• Provides 8-bit identity comparison functionality with active-low output signaling when input vectors match.
• Ensures true TTL compatibility for both input and output interfaces while maintaining CMOS power efficiency.
• Maintains low leakage characteristics with maximum input and output leakage currents limited to 1 μA.

Applications

• Digital data path validation
• Address bus matching verification
• System configuration checking

Procurement Notes

Verify the specific suffix ATQG8 against official Renesas documentation to confirm package type and temperature grade. Ensure the ordering part number matches the required QSOP-20 form factor. Cross-reference RoHS compliance status directly with the manufacturer's current product change notices before finalizing procurement orders.

Selection Notes

Select this component for applications requiring precise 8-bit vector comparison within standard 5V logic systems. The FCT series offers speed advantages over standard LS logic while maintaining pin compatibility. Verify that the 4.75V minimum supply voltage aligns with the target system's power rail stability requirements.

Part Context

This device belongs to the 74FCT family of high-speed CMOS logic devices manufactured by Renesas Electronics. The 74FCT521 specifically addresses identity comparison needs, serving as a digital equivalent to traditional comparator circuits but optimized for faster switching speeds and lower power consumption typical of FCT technology.

Replacement Considerations

The IDT74FCT521ATQG8 is a documented alternate part number for this component. Verify functional equivalence and pinout compatibility before substitution. Check for any updates in the 74FCT521T series specifications that may affect performance parameters.