Maxim Integrated MAX6808UR26+T Microprocessor Reset Circuit

The MAX6808UR26+T from Maxim Integrated is a compact, highly-reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides a significant level of system reliability through its ability to reset a µP during power-up, power-down, and brown-out conditions. With its small SOT23-3 package, it is an ideal choice for space-constrained applications.

This device ensures that the µP is held in reset until the system's power supply has stabilized. If the voltage drops below a preset threshold, the reset signal is asserted, which holds the µP in a reset state. Once the voltage exceeds the reset threshold, the MAX6808UR26+T maintains the reset signal for a minimum of 140ms (typical), providing ample time for the system to stabilize.

The MAX6808UR26+T has a factory-trimmed reset threshold voltage of 2.63V, tailored for 2.5V-powered circuits. This precise voltage threshold helps to prevent false triggering and ensures reliable operation of the connected µP or digital system. Additionally, the low supply current of only 5.5µA (typical) makes this device an energy-efficient choice for portable and battery-operated equipment.

Key features of the MAX6808UR26+T include:

• Factory-trimmed V<sub>CC reset threshold voltage of 2.63V
• Minimum reset timeout period of 140ms
• Low supply current of 5.5µA (typical)
• Guaranteed reset valid down to V<sub>CC = 1V
• Immune to short V<sub>CC transients
• Compact SOT23-3 package

This reset circuit is ideal for use in systems where reliable operation is critical, such as in portable devices, embedded controllers, and other digital systems that require robust power management. The MAX6808UR26+T's combination of features makes it a versatile component that enhances the stability and dependability of electronic systems.

For designers and engineers looking for a simple, yet effective way to protect their digital systems from the perils of unpredictable power supply conditions, the MAX6808UR26+T from Maxim Integrated offers an excellent solution, ensuring that systems are operational and stable at all times.