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UCD90120A: Run time Clock - Drifitng

Part Number: UCD90120A

The Run time clock in the UCD is drifting after the initial setup. This behavior doesn't sound correct. I am able to see the clock drifting by 15minutes in a 24 hour period. I use dual chips in master/slave configuration and both are set up individually and both devices have drifted by different offsets. 

Is this the expected behavior and the run time clock has to be synchronized periodically?