Maxim Integrated MAX6821RUK Microprocessor (µP) Supervisory Circuit

The Maxim Integrated MAX6821RUK is a highly reliable 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 systems with 5V power supplies.

This supervisory circuit is ideal for use in a variety of applications, including computers, controllers, intelligent instruments, and critical µP power monitoring. It ensures that the µP is reset to a known state during power-up, power-down, or brown-out conditions. The MAX6821RUK also monitors the power supply voltage and maintains a reset output until that voltage reaches a stable operating level and remains there for a specified period of time.

The device comes in a compact SOT-23 package, making it an excellent choice for space-constrained applications. It has a factory-trimmed reset threshold suitable for operation with a 5V power supply, and it features an active-low, push-pull RESET output. The MAX6821RUK has a reset timeout period of 140ms (min), providing enough time for the system to stabilize before the µP starts operating.

Key features of the MAX6821RUK include:

• Precision monitoring of 5V power-supply voltages
• Fully specified over temperature
• 140ms (min) reset timeout period
• Active-low, push-pull RESET output
• Low supply current of 6µA (typ)
• Compact 5-pin SOT-23 package

The MAX6821RUK enhances system reliability by preventing code execution errors during power-up, power-down, or brown-out conditions. The low supply current feature makes it suitable for battery-operated equipment. Its ease of integration and robustness makes it a preferred choice for designers looking to improve system stability without incurring significant power or space penalties.

Overall, the Maxim Integrated MAX6821RUK offers a simple and efficient solution for µP system monitoring, providing peace of mind for system designers and operators alike.