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UCC37321: UCC37321, UCC37322 max "in" pin voltage

Part Number: UCC37321

Hi, as the title suggests I'm a bit confused as to what the maximum voltage on the input pin can be. The datasheet states 6v or Vdd (in my case 12v for Vdd) as being the maximum, which one is it?

At the moment I'm currently driving that pin with the same +12v supply as Vdd, will that damage the chips? This goes for a number of other gate drive IC's too which have similar ratings.