The MAX809R-2.63 from Maxim Integrated is a compact, highly-efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in µP and digital systems. It provides a significant level of system reliability with its ability to reset a µP during power-up, power-down, and brown-out conditions. With its precision factory-trimmed threshold voltage set at 2.63V, it ensures that systems powered by 3V to 3.3V supplies can operate safely by resetting the µP whenever the supply voltage drops below the threshold.

This device is specifically engineered to combat the unpredictable nature of system failure caused by power supply instabilities. It asserts a reset signal whenever the V<sub>CC supply voltage declines below the preset threshold, keeping it active until the supply voltage recovers and stabilizes above the threshold. The reset signal remains asserted for a minimum of 140ms after V<sub>CC has risen above the reset threshold level, ensuring that the µP has ample time to return to a stable state before resuming operation.

The MAX809R-2.63 boasts a low supply current of 17µA (typical), making it an energy-efficient choice for portable and low-power applications. Its small footprint and the convenience of its SOT23 packaging allow for easy integration into system designs without compromising board space.

Key features of the MAX809R-2.63 include:

• Precision Monitoring of 3V and 3.3V Power-Supply Voltages
• Fully Specified Over Temperature
• Low Power Consumption: 17µA Supply Current
• 140ms Minimum Power-On Reset Pulse Width
• Guaranteed Reset Valid to V<sub>CC = 1V
• Compact SOT23 Packaging

Designed for use in computers, controllers, intelligent instruments, critical µP and µC power monitoring, the MAX809R-2.63 is the go-to component for system designers looking for a reliable reset circuit that ensures the proper functioning of their digital systems under variable power conditions. Its ease of use and high precision make it a valuable addition to any power-sensitive application.