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CD4066B-Q1: Operation with 3.3V supply

Part Number: CD4066B-Q1

The Recommended Operating Conditions table says the supply voltage VDD can be as low as 3V.  I'd like to use this device with a 3.3V supply. What are the on/off conditions for the control input Vc with a 3.3V supply?  That is, how high does my Vc input have to be to connect the switch, and how low does my Vc input have to be to disconnect the switch?