Maxim Integrated MAX809SEUS Microprocessor Reset Circuit

The MAX809SEUS from Maxim Integrated is a compact, highly efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant line of defense against system failures caused by fluctuations and failures in the power supply. This component is an essential tool for maintaining the reliability and stability of a wide range of electronic applications, including computers, controllers, and intelligent instruments.

The MAX809SEUS 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 brown-out conditions. The reset output remains asserted for a minimum of 140ms after VCC has risen above the reset voltage threshold, providing sufficient time for the system to stabilize.

Key features of the MAX809SEUS include:

• Precision factory-set VCC reset thresholds
• Low power consumption, drawing less than 10µA of supply current
• Capability to operate with a supply voltage ranging from 1.2V to 5.5V
• Open-drain RESET output which can interface with logic of different voltage levels
• Immunity to short VCC transients
• Compact SOT-23 packaging suitable for space-constrained applications

With its built-in hysteresis feature, the MAX809SEUS enhances noise immunity and prevents erratic resets from voltage spikes. Its small footprint and low power consumption make it an ideal choice for portable and battery-operated devices. The device is available in a standard SOT-23 package, which is widely used in industry due to its size and thermal efficiency.

Whether you are designing an embedded system, a consumer product, or any application that requires a reliable reset mechanism, the Maxim Integrated MAX809SEUS provides an effective solution for managing your system's power supply integrity. By integrating this reset circuit into your design, you can enhance the operational stability and safety of your electronic systems.