Maxim Integrated's MAX6348UR43+T Microprocessor Reset Circuit

The MAX6348UR43+T is a highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant increase in system reliability and accuracy compared to separate ICs or discrete components. The device ensures that the µP boots up in a predictable state, even in the event of a system power failure or brownout condition.

This compact supervisory circuit is specifically engineered to maintain system integrity by monitoring the power supply voltage. It features a preset reset threshold voltage of 4.3V, making it suitable for 5V-powered systems that require a precise monitoring voltage level. When the monitored voltage drops below the 4.3V threshold, the MAX6348UR43+T asserts a reset signal, holding the connected µP in a reset state for a minimum of 140ms after the supply voltage exceeds the reset threshold. This ensures the system has adequate time to stabilize before the processor begins operation.

The MAX6348UR43+T comes in a small, 3-pin SOT23 package, offering a space-saving solution for applications where board space is at a premium. Its low supply current of 1.2µA (typical) makes it ideal for portable and battery-operated applications where power efficiency is crucial.

Key features of the MAX6348UR43+T include:

• 4.3V ±2% Reset Threshold Voltage
• 140ms Minimum Power-On Reset Delay
• Low 1.2µA Supply Current
• Immune to Short VCC Transients
• Guaranteed Reset Valid to VCC = 1V
• Compact 3-Pin SOT23 Package

This reset circuit is designed to be versatile, finding applications in a wide range of products such as computers, controllers, intelligent instruments, portable/battery-powered equipment, and other µP-based systems. The MAX6348UR43+T's combination of features, including its low power consumption, high precision, and small footprint, make it a go-to choice for designers looking to enhance the reliability and performance of their systems.

Maxim Integrated's commitment to quality ensures that the MAX6348UR43+T meets the stringent requirements for industrial-grade components, providing a robust solution for critical system monitoring tasks.