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DS280BR810 / about the clock on the CAL_CLK_IN pin

Toshiyuki
Mastermind 7075 points

Other Parts Discussed in Thread: DS280BR810, DS250DF810

Hi,

I have a question about pin-compatibility between DS250DF810 and DS280BR810. If DS250DF810 is replaced with DS280BR810, does 25MHz clock on the CAL_CLK_IN pin have to be disconnected? Should the pin be left floating?

Best Regards,

Kato

  • 0
    TI__Mastermind 19235 points

    The cal_clk_in signal can be present and it will not cause any problem or issue to the repeater. We actually suggests customers to implement this clk signal on their board if a future upgrade to retimer part number is being considered. See DS280BR810 datasheet verbiage below:

    A 25-MHz input clock is only required if there is a need to support a future upgrade to the pin-compatible Retimer device. If there is no need to support a future upgrade to a pin-compatible Retimer device, then a 25-MHz clock is not required. this pin can be left floating. This input pin has a weak active pull down and can be left floating if the CAL_CLK feature is not required.

    Regards,

    Rodrigo Natal

    DPS Applications Engineer