In the 853S310I (Low Skew,1-to-8 Differential-to-3.3V LVPECL/ECL Fanout Buffer) family, what is the difference between 853S310CVILF and 853S310AVILF part numbers ?

The main difference between the "A" and "C" versions of the 853S310 is in the ESD (Machine Model) immunity. Rev C has better ESD immunity. However, the Machine Model for ESD immunity used to be one of qualification items and it is no longer required as per the latest JEDEC specifications.

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