Maxim Integrated MAX822SUS+T Microprocessor Supervisory Circuit

The MAX822SUS+T from Maxim Integrated is a sophisticated microprocessor (µP) supervisory circuit designed to monitor power supplies and microprocessor activity in digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments when used in system monitoring applications.

This device is particularly adept at providing a precise, factory-trimmed V_CC reset threshold and features a debounced manual reset input. The reset output is available in both active-low and active-high configurations, making it versatile for different system requirements. The MAX822SUS+T is capable of asserting a reset signal whenever the V_CC supply voltage declines below the preset threshold, ensuring that the connected microprocessor is reset to a known state during power-up, power-down, and brown-out conditions.

One of the key features of the MAX822SUS+T is its Watchdog Timer (WDT), which monitors the system operation by requiring periodic toggling of a dedicated WDT input to prevent system lock-up. If the WDT sequence is not correctly followed, the device generates a system reset, ensuring proper system recovery and operation.

The MAX822SUS+T operates over a wide supply voltage range and consumes low quiescent current, making it suitable for battery-operated applications. It is provided in a small, space-saving SOT-143 package, which is ideal for space-constrained applications.

Key features of the MAX822SUS+T include:

• Factory-trimmed V_CC reset threshold for precise monitoring
• Debounced manual reset input for additional system control
• Active-low and active-high reset outputs for flexible system integration
• Integrated watchdog timer to prevent system freezes and ensure reliability
• Low quiescent current suitable for battery-powered devices
• Wide operating voltage range accommodating various power supplies
• Compact SOT-143 package for efficient use of PCB space

The MAX822SUS+T is an ideal solution for managing system integrity through monitoring and control of the power supply and processor activity. Its integration of key supervisory functions in a single chip simplifies design, reduces component count, and enhances overall system reliability.