Maxim Integrated MAX6327UR31 Microprocessor Supervisory Circuit

The Maxim Integrated MAX6327UR31 is a highly precise 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 that require voltage monitoring. This device is particularly suited for battery-powered electronics due to its low power consumption and small footprint.

Key features of the MAX6327UR31 include a factory-trimmed reset threshold voltage of 3.1V, which ensures that the µP and other critical components are held in reset until the system voltage reaches a stable and precise level during power-up, power-down, and brown-out conditions. The reset output remains operational with VCC as low as 1.2V, which is ideal for low-voltage applications.

The MAX6327UR31 comes in a compact SOT23 package, making it an excellent choice for space-constrained applications. Its low supply current of only 1µA (typ) is particularly beneficial for portable devices, where extending battery life is of paramount importance. The device also offers a manual reset input that allows a pushbutton or an external signal to initiate a system reset, providing an additional layer of system control.

Additional features include a 140ms min power-on reset pulse width, which guarantees a proper system reset before operation. The device also has a debounced manual reset input, which prevents false triggers due to noisy environments or accidental short pulses. The MAX6327UR31 is capable of asserting reset under freefall conditions, ensuring the system is protected even in the event of sudden power losses.

Overall, the Maxim Integrated MAX6327UR31 is a robust and reliable solution for systems that require accurate and reliable voltage monitoring to protect against data corruption and ensure proper operation. Its combination of features makes it an ideal choice for applications such as portable/battery-powered equipment, computers, controllers, intelligent instruments, and critical µP power monitoring.