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Original question:

LMK6C: LVCMOS Output Characteristics

LMK6C: Out resistor value

Yang Wu
Expert 3030 points
Part Number: LMK6C

Tool/software:

Hi team,

Do we have recommendation of LMK6C output resistor value? customer tried different values and found different overshoot. thanks.

Best regards,

Yang

R51: 33 ohm.

R51: 51ohm.

R51: 100ohm.

  • 0
    TI__Expert 7680 points

    Hi Yang, 

    Generally a series resistor in the range of 17-33 Ohms is used for an LVCMOS driver. Some of the overshoot / ringing that they're seeing could also be from the probe setup. If they need very accurate overshoot measurements, I would recommend using a shielded coax cable (like SMA) and using a high bandwidth scope / probe (probably at least 500MHz for a 25MHz clock signal). If they're measuring the clock output in their system, they should also be sure they're probing as close as possible to the receiver side. 

    Regards, 

    Connor 

  • 0 in reply to Connor Lewis
    TI__Expert 3030 points

    Hi Connor,

    got it. thanks for your help. 

    Best regards,

    Yang