Features Built-in 32.768 kHz crystal unit Interface Type Operating voltage range: 1.70V to 5.5V Wide Timekeeper voltage range Various detection Functions Low backup current 32.768 kHz frequency output function The various functions include full calendar, alarm, timer The I2C-BUS is a trademark of NXP Semiconductors Applications RTC gives a precise time and date, which can be used in many applications. The RTC device plays a vital role in the real time systems like attendance systems, digital clock and digital cameras. This device is a good option where time tamp is required.