Maxim Integrated's MAX809SEURTR-1-V-LF Microprocessor Reset Circuit

The MAX809SEURTR-1-V-LF is a compact, highly reliable microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. Manufactured by Maxim Integrated, a leader in analog and mixed-signal products, this device ensures that your microprocessor system will reset to a known state during power-up, power-down, or brown-out conditions. It is an essential component for maintaining system integrity and preventing software corruption.

This supervisory circuit features a factory-trimmed reset threshold voltage (V<sub>IT), which is tailored for operation with a variety of supply voltages, making it versatile for use in numerous applications. The reset output is asserted when the V<sub>CC supply voltage falls below the reset voltage threshold, and it remains asserted until the supply voltage returns to an acceptable level and a reset timeout period has elapsed. This ensures a proper reset signal to the µP during power-up, power-down, or during a brown-out event.

The MAX809SEURTR-1-V-LF comes in a compact SOT-23 package, which is ideal for space-constrained applications. Its low supply current of only 20µA (typical) makes it suitable for portable and battery-operated devices where power conservation is crucial. Additionally, the device is characterized for operation over a wide temperature range, ensuring reliability and performance even in extreme conditions.

Key features of the MAX809SEURTR-1-V-LF include:

• Factory-trimmed V<sub>IT
• Low supply current of 20µA (typical)
• Guaranteed reset valid to V<sub>CC = 1V
• Power supply transient immunity
• No external components required
• Compact SOT-23 package

Whether you're designing a complex digital system or simply need a reliable reset circuit for your microprocessor, the MAX809SEURTR-1-V-LF by Maxim Integrated offers a proven solution that is easy to integrate and provides peace of mind through its robust power monitoring capabilities.