The MIC803-31D4VM3 is a voltage monitoring circuit or voltage supervisor manufactured by Micrel, now part of Microchip Technology. It is designed to monitor the voltage level of a power supply and provide a reset signal to a microcontroller or other digital system if the voltage falls below a specified threshold. This ensures that the system starts up and operates correctly, preventing data corruption and other malfunctions.

Applications:

• Microcontroller-Based Systems: Used in embedded systems to monitor the power supply voltage of the microcontroller.
• FPGA and DSP Applications: Provides power-on reset and voltage monitoring for FPGAs and DSPs.
• Memory Systems: Protects memory devices from data corruption due to undervoltage conditions.
• Industrial Control Systems: Ensures reliable operation of industrial control equipment.
• Automotive Electronics: Implemented in automotive electronic systems for power supply monitoring.

Features:

• Precision Voltage Monitoring: Accurately monitors the power supply voltage.
• Fixed Threshold Voltage: The MIC803-31D4VM3 has a fixed threshold voltage of 3.08V.
• Open-Drain Output: Requires a pull-up resistor for proper operation.
• Active-Low Reset Output: The reset output is asserted low when the voltage drops below the threshold.
• Small Package Size: Available in a small SOT-23 package.
• Low Supply Current: Consumes very little power.

Benefits:

• Reliable System Startup: Ensures that the system starts up correctly after a power failure or brownout.
• Data Corruption Prevention: Protects memory devices from data corruption due to undervoltage conditions.
• Simplified System Design: Reduces the need for external components.
• Robust System Operation: Provides reliable operation even in harsh environments.
• Low Power Consumption: Minimizes power consumption in battery-powered applications.

Additional Details:

The MIC803-31D4VM3 is available in a SOT-23 package. It operates from a supply voltage range of 1.6V to 5.5V. The reset output remains asserted for a specified reset timeout period after the voltage rises above the threshold.

The device is simple to use, requiring only a pull-up resistor on the reset output and a bypass capacitor on the supply voltage pin.