Maxim Integrated MAX812TEUS+T Microprocessor Reset Circuit

The MAX812TEUS+T is a compact, highly precise microprocessor (µP) supervisory circuit designed by Maxim Integrated 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 a single +3V to +5V power supply voltage. This makes the MAX812TEUS+T an ideal choice for use in a wide array of products, from computers and controllers to portable/battery-powered equipment.

This supervisory circuit is capable of asserting a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring that the µP is reset properly during power-up, power-down, and brown-out conditions. The reset output remains asserted for a minimum timeout period after VCC has risen above the reset threshold level, providing the system with a stable interval to recover from a low voltage condition.

The MAX812TEUS+T comes in a compact SOT-143 package, which is suitable for space-constrained applications. Its key features include a factory-set reset threshold voltage, which simplifies design efforts, and a low supply current of only 17µA, which is beneficial for power-sensitive designs. Additionally, the device boasts a reset active-low output, which can directly interface with the reset pin of most microprocessors, enhancing system stability and functionality.

Another important feature of the MAX812TEUS+T is its immunity to short VCC transients, ensuring that the reset output will only be triggered by legitimate power failures, not by brief glitches on the supply line. The device also offers a debounced manual reset input, which allows for a manual assertion of the reset signal when needed.

In summary, the Maxim Integrated MAX812TEUS+T is a reliable, easy-to-use supervisory circuit that can significantly improve system stability by monitoring the supply voltage and ensuring that the microprocessor resets cleanly in the event of power disturbances. Its small footprint, low power consumption, and robust feature set make it an excellent choice for a wide range of applications where precise voltage monitoring is crucial.