Maxim Integrated MAX825TEXK-T Microprocessor Reset Circuit

The MAX825TEXK-T is a compact, highly efficient microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant level of protection to ensure reliable operation of microprocessors and digital systems by asserting a reset signal whenever the VCC supply voltage drops below a preset threshold.

This supervisory circuit is tailored to maintain system integrity through various features. It offers a 140 ms minimum power-on reset delay, which provides ample time for the system's power supply to stabilize before allowing the processor to run. This delay is fixed and requires no external components, simplifying design and reducing component count.

The MAX825TEXK-T comes in a small, 5-pin SOT-23 package, making it ideal for space-constrained applications. Despite its small size, it delivers robust performance with a low supply current of only 3.5 µA, making it suitable for battery-operated devices. The device operates over a wide voltage range from 1.2V to 5.5V, allowing for versatile applications across different power specifications.

Additionally, the MAX825TEXK-T includes a manual reset input, which provides a direct way to initiate a system reset from an external source. This feature is particularly useful for system maintenance or in situations where an immediate system restart is required without power cycling.

Key features of the MAX825TEXK-T include:

• Precision monitoring of 5V, 3.3V, and other voltage supplies
• 140 ms min power-on reset delay
• Manual reset input
• Low supply current of 3.5 µA
• Wide operating voltage range: 1.2V to 5.5V
• Compact 5-pin SOT-23 package

With its combination of features, the MAX825TEXK-T is an excellent choice for managing system resets in microprocessors, microcontrollers, and other digital systems that require high reliability and precision monitoring of their power supply.