Maxim Integrated MAX6328UR31 Microprocessor Reset Circuit

The MAX6328UR31 from Maxim Integrated is a precision, low-power microprocessor (µP) reset circuit that provides an essential function in ensuring the reliable operation of microprocessor-based systems. Designed to monitor the power supply voltage, this device asserts a reset signal to the µP whenever the supply voltage drops below a preset threshold, thus safeguarding the system from erratic behavior caused by insufficient power.

This particular model, the MAX6328UR31, comes with a fixed factory-set reset threshold voltage of 3.1V, making it suitable for use in 3.3V powered systems that require a tight voltage monitoring threshold. The device operates over a wide supply voltage range from 1.2V to 5.5V, which allows for flexibility in various application designs.

One of the key features of the MAX6328UR31 is its ultra-low supply current of only 1µA (typical), which is ideal for portable and battery-powered applications where power efficiency is crucial. The low power consumption helps extend the battery life of the system, ensuring reliable operation over extended periods.

The reset output from the MAX6328UR31 is available in two configurations: push-pull or open-drain. The push-pull output can directly interface with a microprocessor's reset pin without the need for an external pull-up resistor, while the open-drain output allows for wired-OR connections to facilitate the use of multiple reset circuits in a system.

Additionally, the reset signal from the device is guaranteed to remain asserted for a minimum reset timeout period after VCC has risen above the reset threshold. This ensures that the µP has sufficient time to stabilize and initialize properly before coming out of reset.

The MAX6328UR31 is available in a compact SOT23 package, making it an excellent choice for space-constrained applications. Its robust design includes immunity to short VCC transients, ensuring reliable operation even in noisy environments. With its precision voltage monitoring and low-power consumption, the MAX6328UR31 is a vital component in enhancing system reliability in a wide range of electronic devices.