Maxim Integrated MAX809LEUR+ Microprocessor Reset Circuit

The MAX809LEUR+ is a compact, highly efficient microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant level of system reliability and accuracy required by modern electronic applications. This device is particularly useful for managing the power-on reset function for microprocessors, thereby ensuring the system starts in a known state every time it is powered up.

Featuring a fixed-sense threshold voltage that monitors the power supply voltage, the MAX809LEUR+ asserts a reset signal whenever the VCC supply voltage drops below the preset threshold. The reset signal remains asserted for a period after VCC has risen above the reset threshold level, ensuring the system has sufficient time to stabilize before the processor begins operation. This timeout period is known as the reset timeout period.

One of the key features of the MAX809LEUR+ is its ability to operate with very low supply currents, making it an ideal choice for use in portable battery-operated equipment. The low power consumption helps to extend the battery life of the application it is used in. Furthermore, this device is designed to have an open-drain RESET output, which allows for the connection of multiple devices in a wired-OR configuration.

The MAX809LEUR+ is packaged in a small SOT-23 package, making it suitable for space-constrained applications. It is designed to work over a wide temperature range, which ensures reliable operation under varying environmental conditions. This device is also fully RoHS compliant and lead-free, aligning with environmental standards and regulations.

Overall, the MAX809LEUR+ from Maxim Integrated is an essential component for system designers looking to enhance the reliability and performance of microprocessor-based systems. Its low power consumption, compact design, and robust feature set make it an excellent choice for a wide range of applications, including computers, embedded systems, battery-powered devices, and other digital electronics that require precise monitoring of the power supply voltage.