The RT9819C-27PV is a voltage detector manufactured by Richtek USA Inc. This device monitors the supply voltage of electronic systems and generates a reset signal when the voltage drops below a specified threshold. By doing so, it protects against system malfunctions caused by insufficient voltage levels.

Applications

• Microprocessor-based systems
• Embedded control systems
• Power supply supervision circuits
• Portable and battery-powered devices
• Industrial automation applications

Features

• High-precision voltage detection
• Low operating current
• Open-drain reset output
• Fixed voltage threshold
• Compact package size

Benefits

• Ensures stable and reliable system operation by preventing low-voltage failures.
• Simplifies system design with integrated voltage monitoring capability.
• Prolongs battery life in portable devices due to low power consumption.
• Provides a clear reset signal for proper system initialization and error recovery.
• Reduces PCB footprint due to small package size.

Additional Details

The RT9819C-27PV incorporates an internal high-precision voltage reference and a comparator to accurately monitor the supply voltage. When the voltage falls below the preset threshold (2.7V for this variant), the open-drain output is asserted (low), generating a reset signal. This signal can be connected to the reset input of a microprocessor, microcontroller, or other digital circuitry. Once the voltage rises above the threshold, the output is de-asserted (high) after a predefined delay. The open-drain output allows for flexible connection to various logic levels using an external pull-up resistor. Its low power consumption makes it suitable for battery-powered devices and energy-efficient applications. Its small form factor minimizes PCB area requirements.