Maxim Integrated's MAX823LEXK+T: A Superior Microprocessor Supervisory Circuit

The MAX823LEXK+T from Maxim Integrated is a highly reliable and compact microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems that require voltage monitoring and battery control functions.

This supervisory circuit is particularly suitable for portable and battery-powered applications due to its low power consumption and small footprint. The MAX823LEXK+T is available in a 5-pin SC70 package, offering a space-saving solution for modern compact electronic devices. Its precision voltage monitoring feature ensures systems operate within their specified voltage range, enhancing overall performance and stability.

Key features of the MAX823LEXK+T include:

• Reset Timeout: The device generates a reset signal whenever the monitored voltage falls below the factory-set reset threshold, ensuring the µP system restarts in a known state during power-up, power-down, or brownout conditions. The reset output remains valid with VCC as low as 1.2V.
• Factory-Set Reset Thresholds: The reset thresholds are available for a range of voltages, accommodating different system requirements without the need for external adjustments.
• Low Power Consumption: With a typical supply current of only 3µA, the MAX823LEXK+T is an energy-efficient solution, contributing to the extended battery life of portable devices.
• Manual Reset Input: A manual reset input allows for a system reset to be triggered with an external switch or logic signal, providing additional system control and diagnostic capabilities.

The MAX823LEXK+T also features a debounced manual reset input, which is internally pulled up to VCC with a 30kΩ resistor. This input can be driven from a TTL or CMOS logic line as well as shorted to ground with a switch. The device operates over a wide temperature range of -40°C to +125°C, making it suitable for various operating environments.

Overall, the MAX823LEXK+T supervisory circuit from Maxim Integrated is an essential component for system designers who require a reliable and efficient solution to enhance system integrity and prevent data corruption during power fluctuations.