Interest Deduction on Primary and Second Home Limitations

Have a primary home that the interest deduction is limited under the $750K limitation.  My question is, if I purchase a second home, does that home have it's own separate interest deduction limitation or is it combined with the primary residence?  In my case if it is combined then I would get no additional interest deduction.  If not combined then I could deduct interest up it's own interest limitation.  Which way is it?  Thanks,  Dan C