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LMK00308: unused input pins of lmk00308 & lmk00101

Part Number: LMK00308
Other Parts Discussed in Thread: LMK00101

Hi,

  We are using lmk00308 & lmk00101 in our design ,

  1. out of the 3 clock inputs for both the IC's, we are using clkin0 only , can we leave the  unused  inputs clkin1 & OSCIN floating or should be pulled to gnd ?

2. Refout is not been used in lmk00308 , Refout_en has to be pulled low or can be floating ?