The MAX6809REUR from Maxim Integrated is a precision, low-power voltage detector designed for monitoring battery, power-supply, and regulated system voltages. This device is an essential component for a wide range of applications, including microprocessor and microcontroller-based systems, where it ensures reliable operation by monitoring the power supply to prevent system errors during power-up, power-down, or in the event of a voltage drop below a critical threshold.

The MAX6809REUR comes in a tiny SOT23-3 package, making it an ideal choice for space-constrained applications. It offers factory-trimmed reset threshold voltages ranging from 2.32V to 4.63V, catering to various system requirements. The device features a low supply current of only 1.2µA, which is highly beneficial for battery-powered devices as it helps to extend battery life.

One of the key features of the MAX6809REUR voltage detector is its ability to provide a reset signal to the host processor when the monitored voltage falls below the factory-set reset threshold. The reset output remains asserted for a minimum of 140ms after the voltage exceeds the reset threshold, ensuring the system has adequate time to stabilize before resuming operation. This reset delay prevents system errors that might occur due to brief voltage dips or brown-out conditions.

The device operates over a wide temperature range of -40°C to +125°C, making it suitable for use in harsh environments. In addition, the MAX6809REUR features a low threshold voltage hysteresis, which prevents chattering on the reset output pin when the input voltage is around the threshold level.

Overall, the MAX6809REUR is a robust and reliable voltage detector that offers high accuracy, minimal power consumption, and a compact form factor. It is an excellent choice for designers who need to ensure system stability and protect against the consequences of undervoltage conditions in their electronic products.