2 Replies Latest reply on Jul 13, 2016 5:07 AM by rlacasse_1667151

    Decoupling and unused pins

    rlacasse_1667151

      for the CYD36S72V18, what are your recommendations for power supply decoupling and for handling unused pins?

         

      Thanks,

         

      Rich

        • 1. Re: Decoupling and unused pins
          ajai

          Not sure if you have had a look at our design guide for FullFlex devices - http://www.cypress.com/file/151216/download

             

          It has the status of each of the pins which are not in use. 

             

          For power supply- we recommend to have a decoupling capcitor for every pin and a bulk capacitor for every set of power rails. If there is a space constraint, we recommend to do a power integrity analysis to get the optimal value of bulk/decoupling capacitors array.

          • 2. Re: Decoupling and unused pins
            rlacasse_1667151

            Hi Ajai,

               

            Thanks for your help.  I had found the design guide.

               

            I guess I did not ask my first question very well.  Let's say I am using the left data ports as inputs only and that I need only 70 of the 72 bits.  What should I do with the two unused bits - tie them high via a resistor, tie them to ground or leave them open?

               

            With respect to decoupling, do you recommend any particular value capacitors?

               

            Thanks,

               

            rich