Maxim Integrated MAX6315US26D2-T Microprocessor Reset Circuit

The MAX6315US26D2-T is a compact, highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant level of system reliability through its ability to reset a microprocessor during power-up, power-down, and brown-out conditions, ensuring that the µP starts in a known state.

This device is particularly well-suited for battery-powered electronics, where power conservation is crucial, as it features a low supply current of only 1µA. The MAX6315US26D2-T comes in a small, 4-pin SOT-143 package, making it an excellent choice for space-constrained applications.

One of the key features of the MAX6315US26D2-T is its preset voltage threshold of 2.63V, which is tailored for 2.5V to 3.3V powered circuits. This threshold level ensures that the reset output will remain in the active state until the system voltage has stabilized at the correct level for reliable system operation.

The device offers a factory-trimmed reset timeout period of 210ms, which provides a predictable delay from the time the voltage threshold is crossed until the reset signal is issued to the µP. This delay allows the power supply and the µP to stabilize before normal operation begins.

Additionally, the MAX6315US26D2-T features an active-low RESET output, which is guaranteed to be in the logic low state down to V_CC = 1V. This active-low RESET signal remains asserted for the duration of the timeout period after V_CC rises above the reset threshold voltage, ensuring proper system reset.

The robustness of the MAX6315US26D2-T is further enhanced by its immunity to short V_CC transients, which means that glitches on the supply voltage will not cause a reset, leading to increased system stability.

In summary, the Maxim Integrated MAX6315US26D2-T is a reliable and energy-efficient solution for µP systems requiring precise monitoring and control of the supply voltage. Its small footprint, low power consumption, and robust feature set make it an ideal choice for portable devices, embedded systems, and other applications where system integrity is paramount.