The MIC803-30D4VC3TR is a precision 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 circuit when the voltage falls below a specified threshold. This ensures that the system starts up correctly and avoids erratic behavior due to undervoltage conditions.

Applications:

• Microcontroller Reset Circuits: Used to reset microcontrollers when the power supply voltage drops below the operating voltage, preventing erratic behavior.
• FPGA Reset Circuits: Provides a reliable reset signal for FPGAs during power-up and undervoltage conditions.
• DSP Reset Circuits: Ensures proper startup and operation of digital signal processors (DSPs) by providing a reset signal.
• Memory Protection: Protects memory devices from data corruption by triggering a reset signal when the power supply voltage is unstable.
• Portable Devices: Monitors battery voltage levels in portable devices and initiates a reset when the battery is low.
• Industrial Control Systems: Used in industrial control systems to monitor power supply voltages and prevent damage from voltage fluctuations.

Features:

• Precision Voltage Monitoring: Provides accurate voltage monitoring with a typical accuracy of ±1.5%.
• Low Supply Current: Minimizes power consumption, making it suitable for battery-powered applications.
• Open-Drain Output: Features an open-drain output, allowing for flexible connection to other circuits.
• Small Package Size: Available in small packages such as SOT-23 and SC-70, saving board space.
• Fixed Threshold Voltage: Operates with a fixed threshold voltage, simplifying design and configuration.
• RoHS Compliant: Complies with Restriction of Hazardous Substances (RoHS) directive.

Benefits:

• Improved System Stability: Prevents system malfunctions and data corruption due to undervoltage conditions.
• Extended Battery Life: Low supply current helps to extend the battery life of portable devices.
• Reduced Design Complexity: Fixed threshold voltage simplifies the design of reset circuits.
• Enhanced System Reliability: Increases the overall reliability of electronic systems by preventing failures caused by voltage problems.
• Space Savings: Small package size allows for use in compact electronic devices.
• Flexible Integration: Open-drain output provides flexibility in connecting to various types of circuits.

Additional Details:

The MIC803-30D4VC3TR has a threshold voltage of 3.0V. The output is active low. It comes in a SC-70 package. The operating temperature range is usually between -40°C to +85°C. It typically consumes very low current (in the order of microamperes). It requires a pull-up resistor on the output pin to generate a high-level signal when the voltage is above the threshold. A small capacitor may be used on the input to filter out noise and prevent false resets.