The DS1302 trickle-charge timekeeping chip contains a real-time clock/calendar. It communicates with a microprocessor via a simple serial interface. The real-time clock/calendar provides seconds, minutes, hours, day, date, month, and year information. On-board CR2032 battery provides backup power. Operates on 2-5.5VDC @ 300nA. Overall dimensions 44mm x 23mm x 11mm.
Spec sheet available in PDF format.
Customer Reviews
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Can't beat the price 
Reviewer:
Bernie Walp
from Hilo, Hawaii, U.S.
It is nice that it comes with a new CR2032 battery. The spec. sheet has a link to useful, well commented Arduino code. This is an older edition of the various real-time clocks available. The unit I connected to my Arduino appears to have fallen behind by six seconds over a three-day period, but so what.
1-1 of1
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