Maxim Integrated MAX809LEXR Microprocessor Reset Circuit

The Maxim Integrated MAX809LEXR is a compact, highly efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant level of system reliability and accuracy required in critical electronic applications. This device is particularly well-suited for portable and space-constrained applications due to its small size and low power consumption.

The MAX809LEXR is engineered to assert a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring that the µP resets cleanly during power-up, power-down, and brownout conditions. The reset output remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level, providing ample time for the system to stabilize.

Key Features:

• Precision Monitoring: This device features a factory-trimmed reset threshold voltage, which ensures accurate monitoring of the VCC.
• Low Power Consumption: With its low supply current of 20µA (typical), it is an ideal choice for battery-operated equipment.
• Reset Signal: The reset output is available in both active-low (MAX809L) and active-high (MAX810) options to accommodate different logic level requirements.
• Manual Reset: A manual reset input is provided, which allows for a reset to be triggered with an external switch or logic signal.
• Compact SOT-23 Packaging: The MAX809LEXR comes in a small SOT-23 package, making it suitable for high-density PCB layouts.
• Temperature Range: The operating temperature range of the device spans from -40°C to +85°C, allowing for reliable operation in a wide range of environments.

Applications for the MAX809LEXR include a variety of systems where precise voltage monitoring is critical, such as computers, controllers, intelligent instruments, portable/battery-powered products, and embedded systems. Its ease of integration, combined with its robust feature set, makes it an essential component for maintaining system integrity and preventing data corruption due to unexpected power fluctuations or failures.

Maxim Integrated's commitment to quality ensures that the MAX809LEXR meets the stringent requirements of modern electronic systems, providing designers with a reliable and cost-effective solution for µP supervision.