STMicroelectronics

M74HC85B1R

M74HC85B1R Description

The M74HC85B1R is a 4-bit magnitude comparator IC designed for high-speed digital applications. Manufactured by STMicroelectronics, this device belongs to the 74HC series and is housed in a through-hole package, specifically a tube. It operates within a supply voltage range of 2V to 6V and features a maximum propagation delay of 31ns at 6V with a maximum load capacitance of 50pF. The IC offers three output functions: A<B, A=B, and A>B, providing versatile comparison capabilities. The M74HC85B1R is designed to deliver high performance with a quiescent current of only 4 µA, making it suitable for low-power applications. It also complies with ROHS3 standards and is unaffected by REACH regulations, ensuring environmental compliance.

M74HC85B1R Features

• High-Speed Operation: The M74HC85B1R boasts a maximum propagation delay of 31ns at 6V and 50pF, ensuring rapid signal processing and comparison.
• Low Power Consumption: With a quiescent current of just 4 µA, this IC is ideal for applications where power efficiency is critical.
• Wide Supply Voltage Range: The device operates reliably within a 2V to 6V supply voltage range, offering flexibility in power supply design.
• Versatile Output Functions: The M74HC85B1R provides three distinct output functions: A<B, A=B, and A>B, making it suitable for a variety of digital comparison tasks.
• Environmental Compliance: The IC is ROHS3 compliant and REACH unaffected, ensuring it meets stringent environmental standards.
• Through-Hole Mounting: The through-hole package type facilitates easy integration into various PCB designs, especially in applications requiring robust mechanical stability.
• High Output Current Capability: The IC can source and sink up to 5.2mA, ensuring robust drive capabilities for downstream components.

M74HC85B1R Applications

The M74HC85B1R is well-suited for a range of applications where high-speed digital comparison is required. Some specific use cases include:

• Digital Signal Processing: Ideal for comparing digital signals in real-time, ensuring accurate and rapid decision-making in digital systems.
• Microcontroller Peripherals: Enhances the functionality of microcontrollers by providing efficient comparison capabilities for various digital inputs.
• Data Acquisition Systems: Used in systems where precise and rapid comparison of digital data is necessary, such as in industrial control and monitoring applications.
• Communication Systems: Facilitates the comparison of digital signals in communication protocols, ensuring reliable data transmission and error detection.
• Automotive Electronics: Suitable for applications requiring high reliability and robustness, such as engine control units and advanced driver-assistance systems (ADAS).

Conclusion of M74HC85B1R

The M74HC85B1R is a versatile and high-performance 4-bit magnitude comparator designed for demanding digital applications. Its low propagation delay, low power consumption, and wide supply voltage range make it an excellent choice for a variety of applications. The device's compliance with environmental regulations and its robust through-hole package further enhance its appeal. While the M74HC85B1R is now considered obsolete, it remains a reliable option for legacy systems and applications where its unique features and performance benefits are still highly valued.