DS12C887 and DS1302 do not have trickle charging function. Compare the advantages and disadvantages of the two chips in detail. Thank you?

1, DS12C887 and DS1302 have trickle charging function

2, DS12C887 because of its internal integration of crystal vibration and lithium battery, so it has power failure protection function, and DS1302 needs external crystal vibration and battery, such as power failure, the clock does not work

3. DS12C887 is much more expensive than DS1302