Maxim Integrated's MAX809MEUR Microprocessor Reset Circuit

The MAX809MEUR is a compact, highly efficient microprocessor (µP) supervisory circuit designed by Maxim Integrated to monitor power supplies in digital systems. It provides a significant level of system reliability and accuracy required for controlling microprocessor reset functions. This essential component ensures that the µP boots up in a predictable state every time the system is powered up, comes out of reset, or during a brownout condition.

Key Features

• Precision Monitoring: The device maintains a tight 4.63V threshold, ensuring accurate monitoring of the power supply.
• Low Power Consumption: With a low supply current of 20µA (typical), it contributes to the overall power efficiency of the system.
• Reset Signal: It generates a reset signal for a minimum of 140ms after VCC has dropped below the minimum voltage threshold. This ensures that the system has sufficient time to return to a stable operating condition before the processor starts.
• Manual Reset Capability: A manual reset feature allows for an external signal to trigger the reset, providing additional system control.
• Compact SOT-23 Packaging: The space-saving SOT-23 package makes it ideal for use in systems where board space is at a premium.
• Temperature Range: The device operates over a wide temperature range of -40°C to +85°C, accommodating various operating environments.

Applications

The MAX809MEUR is versatile and can be used in a wide array of applications, including:

• Computers and Controllers
• Embedded Systems
• Portable/Battery-Powered Equipment
• Intelligent Instruments
• Automotive Systems

With its robust design, the MAX809MEUR from Maxim Integrated provides the crucial supervision needed for reliable system operation. By monitoring the power supply voltage and ensuring that the µP resets correctly, it prevents code execution errors and enhances system stability, making it an indispensable component in any digital system design.