74FCT521ZATSO

Overview

The IDT74FCT521ZATSO is an 8-bit identity comparator manufactured by Integrated Device Technology using advanced dual metal CMOS technology. It compares two 8-bit words and outputs a LOW signal when the inputs match bit-for-bit. The device features TTL-compatible inputs and outputs, with typical high-level output voltage of 3.3V and low-level output voltage of 0.3V. It operates within a supply voltage range of 4.75V to 5.25V, supporting commercial temperature ranges up to 70°C.

Feature Summary

• Performs 8-bit identity comparison between two input words
• Provides active LOW output for matching conditions
• Features TTL-compatible input and output logic levels
• Utilizes advanced dual metal CMOS technology for low power consumption

Applications

• Digital data bus monitoring and error checking
• Address decoding in microprocessor systems
• Data validation circuits requiring word-matching verification
• System configuration checks where identical data patterns must be detected

Procurement Notes

Verify that the specific suffix ZATSO corresponds to the required package type and temperature grade as defined in the official IDT datasheet. Confirm that the component meets all electrical specifications for your operating environment, particularly regarding supply voltage stability and input/output compatibility requirements.

Selection Notes

Select this component when an 8-bit parallel identity comparison is required with TTL interface compatibility. Ensure the system design accommodates the CMOS power characteristics and drive capabilities specified for the FCT series. Verify that the package form factor matches the PCB layout constraints and thermal management requirements of the application.

Part Context

This part belongs to the IDT 74FCT521 family of 8-bit identity comparators. The family includes various speed grades (A, B, C) and package options such as DIP, SOIC, and LCC. The 74FCT521 variant represents the standard FAST CMOS speed grade, offering performance equivalent to earlier FAST logic families while maintaining CMOS power efficiency.

Replacement Considerations

Compatible substitutes include other 8-bit identity comparators from the same FCT family, such as IDT74FCT521ATP or IDT74FCT521DTP, provided they share the same pinout and electrical characteristics. Cross-reference package dimensions and lead configurations to ensure mechanical compatibility during replacement.