The PCF8523T/1.118 is a Real Time Clock circuit that is designed to provide a precise and reliable timekeeping solution in a wide range of devices. It is manufactured by NXP and features an 8 pin SOIC package. It operates on an input voltage range of 1.8-5.5V and it uses a 2-wire Interface (I2C) for serial bus data transmission. The PCF8523T/1.118 is widely used for precise timekeeping applications such as calendar, alarm, and watchdog functions in commercial, industrial, automotive, and consumer applications.