Maxim Integrated MAX809REUR Microprocessor Reset Circuit

The Maxim Integrated MAX809REUR is a compact, highly-efficient microprocessor (µP) supervisory circuit designed to monitor power supplies in digital systems. It provides a significant level of protection to ensure reliable operation of microprocessors and other sensitive electronic components. The MAX809REUR is particularly well-suited for portable and space-constrained applications due to its small SOT-23 package.

This device is engineered to assert a reset signal whenever the VCC supply voltage declines below the preset threshold, ensuring that the µP resets cleanly during power-up, power-down, and brown-out conditions. The reset output remains asserted for a minimum timeout period after VCC has risen above the reset threshold level, giving the system time to stabilize before the processor starts operating.

Key Features of the MAX809REUR:

• Precision Monitoring: It offers precise monitoring of the 3V, 3.3V, and 5V power-supply voltages, catering to a broad range of applications.
• Low Power Consumption: The device is optimized for low power consumption, making it ideal for battery-operated systems.
• Manual Reset Input: A manual reset input is provided, allowing for a reset to be triggered with an external push-button or logic signal.
• Reset Timeout: The reset signal timeout period is guaranteed to be at least 140ms, ensuring proper system reset.
• High Threshold Accuracy: Reset threshold accuracy is maintained at ±2% over temperature, which is critical for reliable system operation.
• Immunity to Short VCC Transients: The device is immune to short duration VCC transients, avoiding unnecessary resets due to noise and brief supply fluctuations.
• Temperature Range: It operates over a wide temperature range of -40°C to +105°C, suitable for industrial applications.
• RoHS Compliant: The MAX809REUR is RoHS compliant, adhering to environmental standards and regulations.

Overall, the Maxim Integrated MAX809REUR is a reliable and essential component for any system requiring robust power monitoring and reset capabilities. Its small footprint, combined with its high level of integration, makes it an excellent choice for designers looking to enhance system reliability without compromising on space or power efficiency.