74FCT521CTSOG

Overview

The 74FCT521CTSOG is an 8-bit identity comparator manufactured by Renesas Electronics Corporation. It operates within a supply voltage range of 4.75V to 5.25V and features active low outputs indicating when input A equals input B. The device achieves a maximum propagation delay of 4.5ns at 5V with a 50pF capacitive load. It draws a maximum static current of 10µA and supports output currents of 15mA (high) and 48mA (low). Packaged in a 20-SOIC format, it functions reliably across temperatures from -40°C to +85°C.

Feature Summary

• Performs 8-bit identity comparison with active low output assertion for equality detection
• Provides high drive capability with 48mA low-level and 15mA high-level output currents
• Ensures fast signal integrity through a maximum propagation delay of 4.5ns under standard loading conditions

Applications

• High-speed data bus parity and equality checking systems
• Address matching logic in memory controller interfaces
• Digital system validation circuits requiring precise input comparison

Procurement Notes

Verify component authenticity against Renesas Electronics specifications. Confirm the package type matches the required 20-SOIC footprint. Check RoHS compliance status as indicated in official documentation. Ensure operating temperature ranges align with system environmental requirements. Validate that the active low output polarity suits the downstream logic interface design.

Selection Notes

Select this component for applications requiring precise 8-bit equality detection with minimal latency. The low static power consumption makes it suitable for energy-efficient designs. The robust output drive capabilities allow direct interfacing with various logic families without additional buffering. Consider the specific propagation delay characteristics when designing timing-critical paths.

Part Context

This part belongs to the 74FCT logic family, which combines CMOS density with TTL-compatible speeds. The 74FCT521 series specifically addresses digital comparison needs. Renesas Electronics continues to support this line for industrial and commercial applications requiring reliable logical operations.

Replacement Considerations

Public confirmed substitute part numbers include IDT74FCT521CTSOG.