Maxim Integrated's MAX820RCSE: A Robust Microprocessor Reset Circuit

The MAX820RCSE from Maxim Integrated is a highly reliable and compact microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides a significant level of protection to your system by ensuring that the µP boots up in a predictable state every time. This device is particularly useful in situations where the system requires an assured initialization upon power-up or after a voltage dip.

With its precision voltage monitoring capability, the MAX820RCSE actively monitors the VCC for under-voltage conditions. When the VCC falls below the reset voltage threshold, the reset output is asserted, which remains active until the VCC rises above the reset threshold, plus a minimum reset pulse timeout duration. This timeout ensures that the µP has sufficient time to stabilize and execute a proper startup sequence.

The MAX820RCSE comes in a compact SOP (Small Outline Package), which is ideal for space-constrained applications. It offers a variety of features that make it a versatile choice for system designers:

• Reset Threshold Voltages: This device comes with factory-set reset threshold voltages, which are suitable for a wide range of applications, ensuring compatibility with various microprocessors.
• Reset Timeout: The built-in reset timeout delay prevents system errors by ensuring that the µP reset signal is maintained for a sufficient period after VCC has returned to an acceptable level.
• Low Power Consumption: The MAX820RCSE is designed for low power consumption, making it an ideal choice for portable and battery-operated applications.
• Manual Reset Input: A manual reset input is provided, allowing for a system reset to be initiated at any time, regardless of the VCC conditions.
• Active-Low Reset Output: The reset output is active low, which is a common configuration compatible with a wide range of µP and digital systems.

Maxim Integrated's MAX820RCSE is a robust solution for system stability and reliability. It is particularly suited for use in microprocessor-based systems, embedded controllers, and intelligent instruments where a precise monitoring and reset functionality is critical for the system's performance and integrity.