Maxim Integrated's MAX809REUR-T Microprocessor Reset Circuit

The MAX809REUR-T 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 protection to your microprocessors by ensuring that the system's power-on reset is held active long enough during power-up, power-down, and brown-out conditions. This tiny component is an essential part of maintaining the reliability and stable operation of microprocessor-based systems.

With its precision factory-set voltage thresholds, the MAX809REUR-T is suitable for monitoring 3.3V, 2.5V, and other voltage-powered circuits. The reset output remains asserted for a minimum of 140ms after V_CC has risen above the reset threshold level, which guarantees that the system has sufficient time to stabilize before the processor starts operating. This active-low RESET output makes it compatible with a wide range of microprocessors and microcontrollers that require active-low reset signals.

One of the most significant advantages of the MAX809REUR-T is its low power consumption. The device typically consumes only 17µA of supply current, which is particularly beneficial for portable and battery-operated equipment where power efficiency is critical. Furthermore, its tiny SOT-23 packaging makes it an ideal choice for space-constrained applications, allowing designers to incorporate reset functionality without compromising on board real estate.

The MAX809REUR-T operates over a wide temperature range of -40°C to +85°C, ensuring reliable performance across various environmental conditions. Its immunity to short V_CC transients is another feature that contributes to the robustness of the systems it is integrated into.

Overall, the Maxim Integrated MAX809REUR-T microprocessor reset circuit is a simple yet powerful solution for enhancing system reliability. Its low power consumption, precision voltage monitoring, and compact form factor make it an excellent choice for a broad array of applications, including computers, controllers, intelligent instruments, portable devices, and many other digital systems that require effective power monitoring and management.