ON Semiconductor MAX708SESA-T Microprocessor Supervisory Circuit

The MAX708SESA-T from ON Semiconductor is a highly integrated microprocessor supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides essential functions to ensure system stability, including reset output during power-up, power-down, and brown-out conditions. The device is housed in a compact SOIC-8 package, making it suitable for space-constrained applications.

This supervisory circuit helps to protect sensitive microprocessor systems against the potential damages caused by unpredictable power fluctuations. The MAX708SESA-T asserts a reset signal to the microprocessor during power-up, power-down, and brown-out events, ensuring that the processor always starts in a known state. This reset signal remains asserted until the supply voltage reaches a stable condition, and for a minimum period afterward, allowing the system to fully stabilize before the processor begins operation.

Key features of the MAX708SESA-T include:

• Power Supply Monitoring: Precision monitoring of +5V, +3.3V, and other voltage supplies to ensure they are within tolerance.
• Reset Timeout: A minimum power-on reset pulse width of 200ms provides ample time for the system to stabilize.
• Manual Reset Input: This feature allows for a manual reset, enabling the system to be reset without cycling the power.
• Low Power Consumption: With its low supply current, the device contributes to the overall power efficiency of the system.
• Watchdog Timer: A built-in watchdog timer helps to monitor the system's operation and can reset the microprocessor if it fails to stroke the watchdog within a preset timeout period.

The MAX708SESA-T is ideal for use in a wide range of applications, including computers, controllers, intelligent instruments, critical μP and μC power monitoring, and portable/battery-powered equipment. Its reliability and precision make it an essential component for any system requiring robust power supply monitoring and processor management.

Overall, the ON Semiconductor MAX708SESA-T provides a comprehensive solution for system protection by ensuring that microprocessors and other sensitive components operate within safe voltage parameters, thus enhancing system reliability and performance.