[Epson Toyocom]

•Built in frequency adjusted 32.768 kHz crystal unit.
•Interface Type  : 3-wire serial interface
•Operating voltage range  : 1.6 V to 5.5 V
•Wide Timekeeper voltage range  : 1.6 V to 5.5 V
•Low backup current  : 0.5µA  / 3 V ( Typ. )
•32.768 kHz frequency output function :C-MOS output With Control Pin
•The various functions include full calendar, alarm, timer.