ON Semiconductor MAX809RTR Microprocessor Reset Circuit

The ON Semiconductor MAX809RTR is a compact, highly efficient microprocessor (μP) supervisory circuit designed to monitor power supplies in digital systems. It provides a crucial function by ensuring that the μP and its associated hardware reset to a known state during power-up, power-down, or brown-out conditions. This component is an essential part of a reliable system where consistent operation and protection against unpredictable power events are necessary.

Encased in a small, 3-pin SOT-23 package, the MAX809RTR is engineered for space-constrained applications. It is particularly suitable for portable, battery-operated devices where space and power efficiency are at a premium. The device's active-low reset output is guaranteed to remain asserted for a minimum of 140ms (typical) after V_CC has risen above the designated reset threshold level, ensuring adequate time for the system to stabilize.

The reset threshold voltage for the MAX809RTR is precisely factory-set at 4.63V, a common setting suitable for 5V-powered systems. This precision enables the device to accurately monitor the V_CC level and provide a reliable reset signal, preventing system errors and data corruption due to insufficient power levels.

Additionally, the MAX809RTR boasts a low supply current of just 17μA (typical), which is beneficial for power-sensitive designs. This feature helps to extend the battery life of portable devices, making it an ideal choice for handheld gadgets, consumer electronics, and other applications where power efficiency is crucial.

ON Semiconductor has designed the MAX809RTR with an operating temperature range of -40°C to +85°C, allowing it to function reliably in a wide variety of environments. Whether used in industrial controls, computers, embedded systems, or other sophisticated electronics, this reset circuit stands as a simple yet powerful solution for maintaining system integrity.

In summary, the ON Semiconductor MAX809RTR is a vital component for any digital system requiring robust power monitoring and reset capabilities. Its small footprint, precision performance, and low power consumption make it a top choice for designers looking to enhance system reliability and longevity.