Product Overview: MAX691ACSE+ by Maxim Integrated

The MAX691ACSE+ is a highly integrated microprocessor (μP) supervisory circuit designed to monitor power supplies in μP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in battery-powered systems. This supervisory circuit ensures that the μP starts up in a known state and operates correctly during power fluctuations or power-on/off events.

The device is packed with features that include a precision voltage monitor, watchdog timer, and a manual reset capability. The MAX691ACSE+ monitors the power supply voltage of 5V systems, providing a reset signal to the μP during power-up, power-down, and brown-out conditions. The reset signal remains asserted until the supply voltage reaches the reset threshold level and then maintains the reset for approximately 200ms after the supply voltage exceeds the reset threshold, ensuring a proper system restart.

Another key feature of the MAX691ACSE+ is its watchdog timer, which prevents system lock-up if the μP strays from its normal operation. The device is also equipped with a manual reset input that allows for a simple push-button to reset the μP manually. This input can also be used for remote reset applications.

The MAX691ACSE+ comes in a compact 16-pin Narrow SO package, making it suitable for space-constrained applications. Its operating temperature range of 0°C to +70°C allows it to perform reliably in a wide range of environments and applications.

Furthermore, the device offers a battery-backup power switching function, which is essential for maintaining critical operations during power failures. This feature includes a battery fresh seal to ensure the long-term reliability of the backup battery.

Overall, the MAX691ACSE+ from Maxim Integrated is a versatile and reliable solution for μP system monitoring, providing critical protection and control functions that enhance the stability and safety of electronic systems. Its integration of multiple functions into a single chip makes it an ideal choice for designers looking to streamline their power management systems while ensuring robust operation.