onsemi

74ACT521SJ

74ACT521SJ Description

The 74ACT521SJ is an Identity Comparator IC designed by onsemi, featuring an 8-bit comparison function with an active-low output. This device is part of the 74ACT series, known for its high performance and reliability in digital circuits. The 74ACT521SJ operates within a supply voltage range of 4.5V to 5.5V and offers a maximum propagation delay of 10ns at 5V with a load capacitance of 50pF. It is designed for surface-mount applications and comes in a tube package, making it suitable for automated assembly processes. The device is rated for a quiescent current of 4 µA, ensuring low power consumption, and it supports output currents of up to 24mA for both high and low states. The 74ACT521SJ is classified under ECCN EAR99 and HTSUS 8542.39.0001, and it complies with REACH regulations, being REACH unaffected. Despite its obsolescence, the 74ACT521SJ remains a robust choice for specific applications requiring an identity comparator.

74ACT521SJ Features

• High-Speed Performance: With a maximum propagation delay of 10ns at 5V and 50pF, the 74ACT521SJ ensures rapid signal processing, making it ideal for high-speed digital systems.
• Low Power Consumption: The device maintains a quiescent current of only 4 µA, which is crucial for applications where power efficiency is paramount.
• Robust Output Capability: The 74ACT521SJ supports output currents of 24mA for both high and low states, providing strong drive capabilities for various load conditions.
• Active-Low Output: The active-low output function (A=B) simplifies circuit design and integration, particularly in systems requiring inverted logic signals.
• Surface-Mount Compatibility: The surface-mount mounting type and tube packaging facilitate easy integration into modern PCB designs and automated manufacturing processes.
• Moisture Sensitivity Level (MSL) 1: The device is rated for unlimited exposure to moisture, ensuring reliability in diverse environmental conditions.
• Compliance: The 74ACT521SJ adheres to REACH regulations and is classified under ECCN EAR99 and HTSUS 8542.39.0001, ensuring compliance with international standards.

74ACT521SJ Applications

The 74ACT521SJ is well-suited for a variety of applications where an 8-bit identity comparator is required. Its high-speed performance and low power consumption make it ideal for:

• Digital Signal Processing: In systems requiring rapid comparison of digital signals, such as in data transmission and processing circuits.
• Memory Systems: For comparing address or lines data in memory modules, ensuring accurate and efficient memory management.
• Communication Systems: In protocols where data integrity and rapid signal comparison are critical, such as in error detection and correction mechanisms.
• Industrial Control Systems: For applications requiring reliable and fast digital comparisons, such as in control logic and monitoring systems.

Conclusion of 74ACT521SJ

The 74ACT521SJ, despite being obsolete, remains a reliable and efficient identity comparator IC. Its high-speed performance, low power consumption, and robust output capabilities make it a valuable component for specific applications. The device's compliance with international standards and its compatibility with surface-mount technology ensure its continued relevance in modern electronics. For applications requiring an 8-bit identity comparator with active-low output, the 74ACT521SJ offers a proven solution with significant performance benefits.