The RX-8564LCB3PURESN is a low-power real-time clock module that integrates a frequency-adjusted 32.768 kHz crystal. It communicates via a 400 kHz I2C-Bus interface and operates over a wide voltage range of 1.8V to 5.5V. The device is characterized by its very low backup current, typically 275 nA at 3.0V, making it suitable for battery-powered systems. Additional features include a full calendar, alarm, timer, and a power supply voltage monitoring function. Its low power consumption and integrated feature set make it ideal for a variety of applications requiring accurate timekeeping.