MODEL i330, Revision 1 (manufactured ≤ Nov 2010)
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The Model 330 optical-isolator manufactured before November 2010 is referred to as "i330 Revision 1". It is identical to the newer Revision 2, except power is cabled differently, as described below.  

i240 USB controller and i330 Rev 1
The i240 USB controller requires two i312 power supplies when working with the i330 Rev 1, since each side of the i330 optical isolator requires power, as shown below.

Model 330 Rev1, Electrical Isolator Block Diagram
The internal circuitry of the i330 is summarized below.