Maxim Integrated's MAX6348UR37+T: Precision Microprocessor Reset Circuit

The MAX6348UR37+T is a compact, highly reliable microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in microprocessor and digital systems. It provides a precise, factory-trimmed threshold voltage for detecting power failures or drops below a critical level, ensuring that the µP and its associated hardware are reset to a known state during power-up, power-down, or brown-out conditions.

This device is characterized by its low supply current, making it an excellent choice for use in portable and battery-powered applications. The MAX6348UR37+T operates with a nominal threshold voltage of 3.7V, which is suitable for monitoring 3.3V power supplies and other voltages close to this threshold. The reset output is guaranteed to be in the correct state for V<sub>CC down to 1V, providing a wide operating range.

The reset timeout period of this supervisory circuit is factory-set to a minimum of 140ms, ensuring a proper reset signal duration. This timeout feature is crucial for allowing the system to stabilize before the µP starts or resumes operation. The device is highly accurate with a threshold voltage tolerance of ±2%, which ensures reliable operation even under varying conditions and over temperature.

Maxim Integrated's MAX6348UR37+T comes in a small SOT23 package, making it ideal for space-constrained applications. It is also available in a variety of standard reset threshold voltages, which provides flexibility for designers to choose the appropriate version for their specific application needs.

Key features of the MAX6348UR37+T include:

• Factory-trimmed V<sub>CC reset threshold voltage: 3.7V
• Low supply current: Ideal for battery-powered equipment
• Guaranteed reset valid to V<sub>CC = 1V
• Minimum reset timeout of 140ms
• High threshold accuracy: ±2%
• Compact SOT23 packaging

Overall, the MAX6348UR37+T is a robust and reliable solution for system monitoring and reset functions, ensuring that digital systems operate smoothly and consistently in the face of power instability.