The Real-Time Clock (RTC) Integrated Circuit is a device that provides both clock and calendar functions. It has a 64-bit interface for communication via the Serial Peripheral Interface (SPI), which enables efficient data transfer between devices. The RTC IC is available in a package with 14 pins, arranged in a Small Outline Integrated Circuit (SOIC) format with dimensions of 0.154 inches in width and 3.90mm in package width.