The RT9819C-23GU3 is a voltage detector IC produced by Richtek USA Inc. This device monitors a system's supply voltage and asserts a reset signal if the voltage falls below a predetermined threshold. This functionality protects sensitive components, such as microcontrollers and memory, from malfunctions due to insufficient voltage.

Applications

• Microprocessor and microcontroller-based systems
• Embedded systems
• Power supply monitoring and supervision
• Battery-operated devices
• Portable electronics

Features

• High-accuracy voltage detection
• Low quiescent current consumption
• Open-drain reset output
• Fixed voltage threshold
• Miniature package

Benefits

• Enhances system reliability by preventing errors caused by low voltage.
• Simplifies system design with integrated voltage monitoring.
• Conserves power in battery-powered devices.
• Provides a clean reset signal for proper system initialization.
• Reduces board space requirements.

Additional Details

The RT9819C-23GU3 includes a precise internal voltage reference and comparator to accurately monitor the supply voltage. When the voltage drops below the specified threshold (2.3V for this version), the open-drain output asserts low, signaling a reset condition. This low 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. The open-drain configuration requires an external pull-up resistor. Its low quiescent current makes it suitable for low-power applications. Its availability in a small package makes it ideal for space-constrained designs.