•Built in frequency adjusted 32.768 kHz crystal unit.
•Interface Type : SPI & I 2 C -Bus
•Operating voltage range : 1.6Vto5.5V
•Wide Timekeeper voltage range : 1.1Vto5.5V
•Low backup current : 170nA/3V(Typ.)
•Built-in user RAM : 128 bit ( 8 bit 16, SRAM)
•Auto power switching functions
: When V DD deteriorates than 1.6V, internal source is switched to V BAT