ON Semiconductor MAX809SQ308T1G Microprocessor Reset Circuit

The ON Semiconductor MAX809SQ308T1G 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 MAX809SQ308T1G is a versatile component that can be integrated into a wide range of applications, including computers, embedded systems, and other microprocessor-based equipment.

This device is specifically engineered to maintain system integrity by asserting a reset signal whenever the VCC supply voltage falls below a preset threshold. The reset signal remains active for an adequate period after VCC has risen above the reset voltage level, ensuring that the system has stabilized before the processor starts or resumes operation. This feature helps prevent system errors and data corruption during unpredictable power events.

The MAX809SQ308T1G operates with a nominal threshold voltage of 3.08V, which makes it suitable for use in 3.3V powered systems. It is designed for precision with a tight threshold tolerance, ensuring accurate monitoring of the power supply. The device's low supply current of only 20 µA (typical) makes it an energy-efficient choice for portable and battery-operated applications.

Constructed in a compact SOT-23 package, the MAX809SQ308T1G is optimized for space-constrained applications. Its small footprint allows it to be easily integrated into modern PCB designs without occupying significant board space. Moreover, the device is characterized for operation over a temperature range of -40°C to +85°C, which ensures reliable performance in diverse environments and under varying thermal conditions.

ON Semiconductor's commitment to quality is evident in the MAX809SQ308T1G, with features like its immunity to short VCC transients and its built-in ability to reject fast transient glitches on the VCC line. This results in a robust and dependable component that enhances the reliability of the entire system it is a part of.

In summary, the MAX809SQ308T1G from ON Semiconductor is an essential component for any design requiring a reliable reset mechanism for microprocessors, offering precision, low power consumption, and a small package size.