Maxim Integrated MAX809TEXR+T Microprocessor Reset Circuit

The MAX809TEXR+T is a highly reliable and compact microprocessor (μP) supervisory circuit from Maxim Integrated, designed to monitor power supplies in μP and digital systems. It provides a significant function by asserting a reset signal whenever the VCC supply voltage drops below a preset threshold, ensuring that the μP resets cleanly during power-up, power-down, or brown-out conditions.

This device is particularly suitable for portable, battery-operated applications due to its low power consumption and small footprint. The MAX809TEXR+T comes in a 3-pin SOT-23 package, which is ideal for space-constrained applications. It is an essential component for enhancing system reliability and preventing erratic operation caused by unstable power supplies or unexpected power failures.

Key features of the MAX809TEXR+T include:

• Precision Voltage Monitoring: The IC has a factory-trimmed reset threshold voltage, which ensures accurate monitoring of the VCC supply voltage.
• Low Power Consumption: Designed for power-sensitive applications, it has a typical supply current of only 20μA, making it an energy-efficient choice.
• Manual Reset Capability: It includes a manual reset input that allows for a system reset to be initiated with an external switch or logic signal.
• Reset Timeout: After VCC has risen above the reset threshold, the reset output remains asserted for a fixed timeout period, providing enough time for the system to stabilize.
• High-Temperature Operation: The device is capable of operating over a wide temperature range, making it suitable for industrial applications.

The MAX809TEXR+T's reset output is available in either active-low (MAX809) or active-high (MAX810) configurations, providing design flexibility to accommodate different logic levels. This makes it versatile for integration into a wide array of μP systems, from consumer electronics to automotive applications.

Overall, the Maxim Integrated MAX809TEXR+T is a robust and precise solution for system reset management, ensuring that digital systems maintain integrity and reliability under various operating conditions.