The RT9819C-25PV is a voltage detector manufactured by Richtek USA Inc. This device is designed to monitor the supply voltage of electronic systems and provide a reset signal when the voltage drops below a specified threshold. This function ensures proper system operation by preventing errors and data corruption caused by low voltage conditions.

Applications

• Microprocessor and microcontroller systems
• Embedded systems
• Power supply monitoring
• Battery-powered devices
• Industrial control equipment

Features

• Accurate voltage detection
• Low quiescent current
• Open-drain reset output
• Fixed threshold voltage
• Small package size

Benefits

• Improves system reliability by preventing low-voltage related malfunctions.
• Simplifies system design with integrated voltage supervision.
• Reduces power consumption in battery-powered applications.
• Provides a clean reset signal for system initialization and recovery.
• Saves board space.

Additional Details

The RT9819C-25PV utilizes an internal precision voltage reference and a comparator to accurately detect the input voltage. When the voltage falls below the set threshold (2.5V for this specific version), the open-drain output is asserted low, signaling a reset condition. This signal can be connected to the reset input of a microprocessor or microcontroller. Once the voltage rises above the threshold, the output de-asserts (goes high) after a defined delay. An external pull-up resistor is required for the open-drain output. Its low quiescent current makes it suitable for low-power applications. The device is available in a small package, saving valuable board space.