The MIC803-44D4VM3 is a voltage supervisor manufactured by Micrel (now Microchip Technology). It's designed to monitor the power supply voltage of a system and provide a reset signal when the voltage drops below a certain threshold, preventing erratic behavior and data corruption.

Applications:

• Microprocessor and Microcontroller Systems
• Memory Systems
• Power Supply Monitoring
• Critical System Monitoring
• Portable Devices

Features:

• Precision Voltage Monitoring
• Factory Set Thresholds (e.g., 4.4V in this case)
• Active-Low Reset Output
• Open-Drain Output
• Small Package Size (e.g., SOT-23)
• Low Supply Current
• Immunity to Transient Voltages

Benefits:

• Prevents system malfunctions due to low voltage
• Ensures reliable system operation
• Simple to implement with minimal external components
• Space-saving design suitable for portable devices
• Low power consumption minimizes impact on battery life
• Protects data integrity

Additional Details:

The MIC803-44D4VM3 monitors the input voltage and asserts the reset output (active low) when the voltage falls below its preset threshold of 4.4V. The reset output remains asserted for a certain timeout period after the voltage rises above the threshold, ensuring that the system has enough time to initialize properly. Because it has an open-drain output, a pull-up resistor is required. The SOT-23 package makes it easy to integrate into tight board layouts. Specific timing characteristics and component selection guidelines can be found in the device's datasheet.