Real time clock module Epson Toyocom Built-in 32.768 kHz-DTCXO, High Stability I2C-Bus INTERFACE REAL TIME CLOCK MODULE RX 8025T Product Number (Please contact us) RX-8025T : X1B0000120010 Built in frequency adjusted 32.768 kHz crystal unit and DTCXO. Interface Type : I2C-Bus Interface (400 kHz) Interface voltage range : 1.8 V to 5.5 V Temp.compensated voltage range: 2.2 V to 5.5 V Wide Timekeeper voltage range : 1.6 V to 5.5 V