The CAT811R is a supervisory circuit manufactured by Catalyst Semiconductor. It provides essential system monitoring and protection functions, ensuring reliable operation of microprocessors, microcontrollers, and other digital systems. This device is specifically designed to monitor the power supply voltage and generate a reset signal when the voltage falls below a specified threshold.

Applications

• Microprocessor/Microcontroller Systems
• Embedded Systems
• Industrial Control Systems
• Automotive Electronics
• Portable Equipment

Features

• Precision Voltage Monitoring: Accurately monitors supply voltage levels.
• Power-On Reset Generation: Generates a reset pulse during power-up to ensure proper system initialization.
• Low Supply Current: Minimizes power consumption in battery-powered applications.
• Active-Low Reset Output: Provides a reset signal that is active when the voltage is below the threshold.
• Open-Drain Output: Allows for flexible connection to other system components.

Benefits

• Prevents Data Corruption: By generating a reset signal during power failures or brownouts, it helps prevent data corruption in memory.
• Ensures Reliable System Operation: Monitors the power supply voltage and resets the system if the voltage falls out of the acceptable range.
• Simplifies System Design: Integrates essential system monitoring functions into a single chip.
• Extends Battery Life: Low power consumption makes it suitable for battery-powered devices.
• Enhances System Stability: By providing a reliable reset signal, it ensures that the system starts up and operates correctly.

Additional Details

The CAT811R operates over a wide supply voltage range. The reset threshold voltage is precisely defined, and the device typically offers a fixed reset timeout period. The output is usually an active-low, open-drain configuration, allowing for easy interfacing with various microcontrollers and microprocessors. Consult the datasheet for specific voltage thresholds, timing parameters, and operating temperature ranges. Due to its end-of-life status, consider sourcing alternatives for new designs.