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LMK00308: Have a doubt regarding termination on the clock input pins

Part Number: LMK00308

Hi Experts,

Our customer has a doubt regarding what is the input termination on the clock inputs pins and what should be the trace impedance as he is driving these pins from a clock buffer which is generating a 85ohm HCSL output. So based on the input termination he has to select the trace impedance and the buffer clock out series termination but the datasheet does not mention about the clock input termination. 

Please help advise. Thank you.

Best regards,