Maxim Integrated MAX803MEXR+T Microprocessor Reset Circuit

The Maxim Integrated MAX803MEXR+T is a compact, highly-reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the µP and its peripherals are reset properly during power-up, power-down, or brown-out conditions. The device helps in maintaining the integrity of the system's operation by preventing code execution errors due to insufficiently stable system voltages.

This supervisory circuit comes in a small 3-pin SOT-23 package, making it an ideal choice for space-constrained applications where board real estate is at a premium. The MAX803MEXR+T is designed to assert a reset signal whenever the V_CC supply voltage falls below the factory-set reset threshold level. The reset output remains asserted for a preset timeout period after V_CC has risen above the reset threshold level, ensuring the system has adequate time to stabilize before the processor begins operation.

Key features of the MAX803MEXR+T include:

• A factory-trimmed reset threshold voltage suitable for a wide range of applications.
• A reset timeout period that provides a minimum of 140ms (typical) to ensure proper system reset.
• Low supply current, making it an energy-efficient choice for power-sensitive designs.
• An active-low RESET output that is guaranteed to be in the correct state for V_CC down to 1V.
• Immunity to short V_CC transients, ensuring stable operation under noisy conditions.

The MAX803MEXR+T operates over a wide voltage range and temperature range, making it suitable for many digital systems, including computers, controllers, intelligent instruments, portable/battery-powered equipment, and embedded systems. Its ease of integration and minimal external components requirement make it a go-to solution for system designers looking to enhance the reliability of their microprocessor-based systems.

Maxim Integrated's commitment to quality and reliability is evident in the MAX803MEXR+T, which is designed to meet the stringent requirements of high-availability systems. Whether you are designing a new system or looking to improve the reset functionality of an existing one, the MAX803MEXR+T offers a simple and effective solution.