Maxim Integrated MAX6367LKA29+T Microprocessor Supervisory Circuit

The Maxim Integrated MAX6367LKA29+T is a highly reliable and precise microprocessor (µP) supervisory circuit designed to maintain system integrity during power-up, operation, and power-down. This compact, low-power device is essential for monitoring the power supply voltages in µP and digital systems, ensuring that the system operates safely within its specified voltage thresholds.

This supervisory IC comes in a small, 8-pin SOT23 package, making it an excellent choice for space-constrained applications. It offers a factory preset reset threshold voltage of 2.93V, which is ideal for managing 3.3V powered systems. The MAX6367LKA29+T provides a robust set of features, including a manual reset input, which allows for a system reset to be initiated by external hardware or software control.

One of the critical functions of this device is to provide a reset signal to the µP during power-up, power-down, or whenever the VCC supply voltage falls below the preset threshold. The reset output remains asserted for a minimum reset timeout period after VCC has risen above the reset threshold, ensuring the µP has sufficient time to stabilize and initiate proper system operation. This timeout period is typically 140ms, which helps prevent system errors due to premature release of the reset signal.

Moreover, the MAX6367LKA29+T features a low supply current of 1.5µA (typical) at VCC = 3.3V, which is particularly beneficial for battery-operated devices where power conservation is crucial. The device operates over a wide supply voltage range of 1.2V to 5.5V, providing versatility across various applications.

With its built-in watchdog timer, the MAX6367LKA29+T can also monitor software execution integrity by requiring periodic servicing of the watchdog timer. If the timer is not serviced within a preset time frame, the device assumes a system fault and issues a reset, thus providing an additional layer of system protection.

In summary, the Maxim Integrated MAX6367LKA29+T is a versatile, low-power supervisory circuit that offers critical protection for digital systems, ensuring reliable operation and system stability across a range of applications.