Maxim Integrated MAX793RCSE-T Microprocessor Supervisory Circuit

The MAX793RCSE-T is a highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated 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 system monitoring applications.

This supervisory circuit ensures that the µP is reset to a known state during power-up, power-down, or brownout conditions. The MAX793RCSE-T features an active-low reset signal that remains asserted for a minimum of 140ms after VCC has risen above the reset threshold level, ensuring that the µP has adequate time to initialize and start up correctly after a reset event.

The device operates with a supply voltage range from 1V to 5.5V, making it suitable for low-power portable devices as well as standard 5V digital systems. Its low supply current of 17µA (typical) is ideal for battery-operated equipment.

With its precision factory-set VCC reset thresholds, the MAX793RCSE-T caters to a wide variety of applications. It is available in a compact 16-pin narrow SO package, which is ideal for space-constrained applications.

Key features of the MAX793RCSE-T include:

• Programmable Watchdog Timer: This feature allows users to set a timer to monitor the µP activity and initiate a system reset if the µP fails to provide a periodic signal.
• Manual Reset Input: A dedicated manual reset input enables users to trigger a system reset with an external switch or logic signal.
• Active-Low Reset Output: The reset output remains low when VCC is below the reset threshold or during manual reset input, ensuring a reliable system reset.
• Power-Fail Comparator: This built-in feature detects when the supply voltage falls below a preset threshold, providing an early warning of impending power failure.
• Low Battery Warning: The device can also monitor for a low battery condition, adding an extra layer of security for battery-powered devices.

The MAX793RCSE-T is the go-to solution for system designers looking for a simple, cost-effective way to enhance system reliability and performance. Its robust feature set and ease of integration make it a versatile component for a wide range of applications, from computers and controllers to portable consumer electronics.