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CDCLVC1102 unused output

Adi Berger
Prodigy 50 points
Other Parts Discussed in Thread: CDCLVC1102

Hi,

I would like to use CDCLVC1102 as 135MHz clock buffer.  I only need one clock output (Y0).

To prevent its other clock output (Y1) from noising the board, I want to put parallel capacitor from Y1 to GND.

Will it damages the device? 

  • 0
    TI__Mastermind 28560 points
    The best thing to do is just leave Y1 disconnected.

    Traditional LVCMOS drives a high impedance capacitive load of some amount of capacitance, which leaving the Y1 pin open, should emulate pretty well. Note the higher capacitive load it drives (if you were to add a cap), you would simply cause the device to consume more current.

    73,
    Timothy
  • 0 in reply to Timothy T
    Prodigy 50 points

    I was referring to a small capacitor (typically XXpF)  that will reflect low AC impedance @135MHz but will not consume DC current.

  • 0 in reply to Adi Berger
    TI__Mastermind 28560 points
    I don't think it's necessary, and as you can see from the typ char, would just add Icc. However you can always remove a component if you have the footprint there, but you can't really add the component in production without a footprint.
    But the important thing, if you were to add a footprint, any trace length you add could create some issues by reflections. By having effectively no trace beyond the solderdown pad, you are in a best case scenario.