Maxim Integrated MAX809SEUR+TG05 Microprocessor Reset Circuit

The Maxim Integrated MAX809SEUR+TG05 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 associated circuitry reset cleanly during power-up, power-down, or brown-out conditions. This device is an essential component for maintaining system integrity and preventing software execution errors due to incomplete system initialization.

The MAX809SEUR+TG05 comes in a small SOT-23 package, which is ideal for space-constrained applications. It is specifically designed to assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at least 140ms after VCC has risen above the reset threshold level. This feature ensures that the system has sufficient time to stabilize before the processor begins operation.

One of the key benefits of the MAX809SEUR+TG05 is its precision factory-trimmed reset thresholds suitable for a wide range of applications, including 3V, 3.3V, and 5V powered systems. The device operates over a wide supply voltage range from 1.2V to 5.5V, which allows for flexible integration into various system designs.

Additionally, the low power consumption of the device makes it an excellent choice for portable and battery-powered equipment. The MAX809SEUR+TG05 has an active-low RESET output, which is guaranteed to be in the correct state for VCC down to 1.1V, making it highly reliable across all operating conditions.

Another advantage of this reset circuit is its immunity to short VCC transients, ensuring that the reset output will remain in a non-asserted state unless a bona fide reset condition occurs. This feature helps prevent unnecessary system resets and the resulting disruptions in system operations.

In summary, the Maxim Integrated MAX809SEUR+TG05 is an essential component for any system requiring robust and reliable reset functionality. Its small footprint, low power consumption, and precision voltage monitoring capabilities make it a versatile solution for safeguarding microprocessor systems across a broad range of applications.