The RT9819B-26PV is a voltage detector IC manufactured by Richtek USA Inc. This device is designed to monitor voltage levels in electronic circuits and provide a reset signal when the voltage drops below a predefined threshold. It is commonly used in microcontrollers, memory devices, and other critical systems to ensure reliable operation by preventing data corruption or system malfunctions during voltage sags or power failures.

Applications

• Microcontroller systems
• Memory devices (SRAM, Flash)
• Real-time clocks (RTC)
• Power management circuits
• Portable devices

Features

• Precise voltage detection: Accurately monitors the supply voltage with a high degree of precision.
• Fixed threshold voltage: The detection threshold is fixed at a specific voltage level (2.6V in this case), providing a reliable reset signal.
• Open-drain reset output: The reset output is open-drain, allowing for flexible interfacing with other devices and easy implementation of wired-OR configurations.
• Low supply current: Consumes very little current, making it suitable for battery-powered applications.
• Small form factor: Compact package design allows for easy integration into space-constrained applications.
• Built-in hysteresis: Prevents oscillation near the threshold voltage by introducing hysteresis.

Benefits

• System reliability: Ensures reliable operation of electronic systems by providing a reset signal during voltage sags or power failures.
• Data protection: Prevents data corruption in memory devices by initiating a reset sequence before the voltage drops below a critical level.
• Simplified system design: Requires minimal external components, simplifying the design process.
• Low power consumption: Minimizes power consumption, extending battery life in portable devices.
• Cost-effective solution: Provides a cost-efficient solution for voltage monitoring and reset generation.

Additional Details

The RT9819B-26PV typically comes in small surface-mount packages (e.g., SOT-23 or similar). The open-drain reset output requires a pull-up resistor. The specific value of the pull-up resistor depends on the application and the load on the reset line. The device's datasheet provides detailed information on electrical characteristics, timing diagrams, and application circuits. Careful consideration should be given to the selection of the pull-up resistor and the layout of the PCB to ensure optimal performance and noise immunity.