Maxim Integrated MAX6326UR26 Microprocessor Reset Circuit

The MAX6326UR26 is a highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in µP and digital systems. It provides a significant level of system stability by asserting a reset signal whenever the VCC supply voltage declines below a preset threshold, ensuring that the µP resets cleanly during power-up, power-down, and brown-out conditions.

This precision circuit is tailored for portable and battery-powered equipment due to its low power consumption and compact SOT23 packaging. The MAX6326UR26 is an ideal solution for maintaining system integrity and preventing software corruption in embedded systems, communication devices, and other sensitive electronic applications.

Key features of the MAX6326UR26 include:

• Precision Factory-Set V<sub>CC Reset Thresholds: The device comes with a preset V<sub>CC reset threshold of 2.6V, suitable for operation with standard 3V power supplies.
• Low Power Consumption: With its ultra-low supply current of only 1µA (typical), the MAX6326UR26 is optimized for battery-powered applications, extending the battery life of portable devices.
• Reset Signal Valid to V<sub>CC = 1V: The reset output remains operational with V<sub>CC as low as 1V, ensuring reliable system reset even during extreme brown-out conditions.
• Immune to Short V<sub>CC Transients: Fast transients on the V<sub>CC line are filtered, preventing false resets and maintaining system stability.
• Manual Reset Input: An external manual reset input is provided, allowing for a system reset to be triggered on demand.
• Compact SOT23 Packaging: The small SOT23-3 package minimizes the footprint on PCBs, making it perfect for space-constrained applications.

For applications requiring specific reset threshold voltages, Maxim Integrated offers a variety of factory-trimmed versions. The MAX6326UR26 is part of a family of µP reset circuits that cater to a wide range of supply voltages and applications.

By integrating the MAX6326UR26 into your design, you can enhance the reliability and performance of your electronic systems, ensuring that they operate smoothly across various conditions and power supply fluctuations.