Maxim Integrated MAX6809RUR Microprocessor Reset Circuit

The Maxim Integrated MAX6809RUR is a highly reliable, low-power microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in systems with +2.5V to +5.0V power supplies.

This compact device is housed in a space-saving SOT-23 package, making it ideal for portable and space-constrained applications. The MAX6809RUR offers a variety of features that ensure system stability. One of the key features is its ability to assert a reset signal whenever the V<sub>CC supply voltage falls below a preset threshold, keeping it asserted for at least 140ms after V<sub>CC has risen above the reset threshold. This reset timeout period allows the system to recover and return to a known state, which is crucial for reliable operation.

The device also includes a manual reset input that allows the user to initiate a system reset with an external pushbutton or logic signal. This added flexibility is beneficial for systems that require user intervention or for initiating a reset remotely. The MAX6809RUR's open-drain RESET output can interface with a variety of logic levels, making it compatible with most digital systems.

Designed to minimize power consumption, the MAX6809RUR draws a low quiescent current of only 1.6µA, which is particularly important for battery-powered devices where power efficiency is critical. This ensures that the system's power supply is not unduly burdened by the supervisory circuit, thereby extending battery life.

The MAX6809RUR operates over a wide temperature range of -40°C to +125°C, allowing it to be used in environments with varying temperature conditions. Its robust design and high-quality construction make it a reliable choice for mission-critical applications across various industries, including consumer electronics, automotive, telecommunications, and industrial control systems.

In summary, the Maxim Integrated MAX6809RUR is an essential component for system designers looking to enhance the reliability and stability of their microprocessor-based systems, with minimal power draw and without the need for additional external components.