Maxim Integrated MAX6347UR35+ Microprocessor Reset Circuit

The MAX6347UR35+ is a highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant line of defense against system failures caused by fluctuations and failures in the power supply. This precision circuit ensures that the microprocessor and associated digital systems reset to a known state during a power failure or brown-out condition.

Featuring a factory-trimmed reset threshold voltage of 3.5V, the MAX6347UR35+ is particularly well-suited for 3.3V-powered systems that require a higher threshold to account for noise and transients on the power supply line. This device is capable of monitoring the supply voltage and asserting a reset signal to the host processor whenever the monitored voltage drops below the threshold. The reset output remains asserted for a minimum timeout period after the supply voltage rises above the reset threshold, ensuring the system has adequate time to stabilize.

The compact SOT23 packaging of the MAX6347UR35+ makes it an ideal choice for space-constrained applications. Despite its small size, it delivers robust performance with features such as a low supply current of typically 1.2µA, which is crucial for battery-powered devices where power conservation is paramount. Additionally, the device has an operating temperature range of -40°C to +125°C, which allows it to perform reliably in a wide range of environmental conditions.

Key features of the MAX6347UR35+ include:

• Factory-trimmed V_CC reset threshold voltage of 3.5V
• Low, 1.2µA supply current
• Guaranteed reset valid to V_CC = 1V
• Minimum 140ms reset timeout period
• Immune to short V_CC transients
• Available in a small SOT23 package

Applications that can benefit from the MAX6347UR35+ include portable/battery-powered equipment, computers, controllers, intelligent instruments, critical µP and µC power monitoring, and automotive systems. It is a robust solution for any system where data integrity and reliable operation are of paramount importance.

Overall, the MAX6347UR35+ from Maxim Integrated is an essential component for maintaining system integrity and preventing data corruption during power supply anomalies.