ON Semiconductor MAX803SQ463T1G - Voltage Monitoring Microprocessor Reset Circuit

The ON Semiconductor MAX803SQ463T1G is a compact, highly precise voltage monitoring device designed to safeguard microprocessors by resetting them under power failures or brown-out conditions. This device is an essential component for ensuring the reliable operation of microprocessor systems where data integrity and system stability are of utmost importance.

The MAX803SQ463T1G operates by monitoring the supply voltage (V<sub>CC) and maintaining a reset output to the microprocessor until the supply voltage stabilizes at the correct operating level. It provides an active-low reset signal, ensuring that the connected microprocessor remains in a reset state during power-up, power-down, or brown-out conditions. This reset signal is maintained for a minimum of 140ms (typical) after V<sub>CC has risen above the designated reset threshold level, allowing the power supply and processor to stabilize before the system startup commences.

Key features of the MAX803SQ463T1G include:

• High precision voltage monitoring for 4.63V power supplies.
• Low supply current of 17μA (typical), making it suitable for battery-operated devices.
• Immunity to short V<sub>CC transients, ensuring reliable operation under fluctuating power conditions.
• An active-low, open-drain RESET output which can interface directly with the reset pin of most microprocessors.
• Temperature range from -40°C to +85°C, allowing for use in a wide variety of environmental conditions.

This voltage monitoring device comes in a compact SOT-323 package, making it an ideal choice for space-constrained applications. The MAX803SQ463T1G is commonly used in microprocessor-based systems, such as computers, controllers, and intelligent instruments, where it contributes to enhancing system reliability and preventing data corruption during power instability.

With ON Semiconductor's commitment to quality and reliability, the MAX803SQ463T1G is a robust solution for any design requiring precise voltage monitoring and system reset functionality. It is a testament to ON Semiconductor's expertise in providing components that ensure the smooth operation of electronic systems in a variety of challenging conditions.