ON Semiconductor CAT809ZEUR Microprocessor Supervisory Circuit

The ON Semiconductor CAT809ZEUR is a highly reliable microprocessor supervisory circuit designed to maintain system integrity during power failures or unexpected system shutdowns. This compact device is an essential component for managing system resets and is particularly suitable for battery-powered equipment where power conservation is critical.

The CAT809ZEUR offers a precise monitoring solution to ensure that the microprocessor (µP) and other critical system components are reset during power-up, power-down, or brown-out conditions. It is designed to assert a reset signal whenever the V<sub>CC supply voltage declines below a preset threshold, maintaining it until the supply voltage stabilizes above the minimum operating threshold. This reset signal ensures that the µP and other devices start in a known state, thereby preventing erratic system behavior.

Key Features:

• Precision Monitoring: The device features a tight 2.93V threshold voltage, providing accurate monitoring of V<sub>CC.
• Low Power Consumption: With a low supply current of only 9 µA, the CAT809ZEUR is optimized for power-sensitive applications.
• Manual Reset Input: A manual reset input is provided, allowing for an external trigger to initiate a system reset.
• Reset Timeout: It offers a 140 ms minimum reset timeout delay, ensuring adequate time for the system to stabilize during power-up.
• Operating Range: The device operates over a wide temperature range of -40°C to +85°C, suitable for various environmental conditions.
• Compact Packaging: The supervisory circuit comes in a small 3-pin SOT-23 package, making it ideal for space-constrained applications.

The CAT809ZEUR is designed for use in a variety of applications, including microprocessor systems, computers, controllers, intelligent instruments, and portable electronics where reliable system operation is paramount. Its ability to monitor V<sub>CC in digital systems and provide a reset signal ensures that the system operates correctly during power-up, power-down, and brown-out conditions. This makes the ON Semiconductor CAT809ZEUR an essential component for enhancing system reliability and preventing data corruption.