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CDCE18005: Input clock for non-powered device

Maximilian Straub
Prodigy 20 points
Part Number: CDCE18005

Hello everyone,

is it a problem if the CDCE18005 is not powered, but there is a clock at the PRI_REF input? This is an AC-coupled LVDS clock. 

According to the absolute maximum ratings it should not be a problem?

Thank you very much for an answer.

Maximilian 

  • 0
    TI__Mastermind 18950 points

    Hi Maximilian,

    Normally clock buffers are not supposed to receive input signals when they are powered down due to risk of damage. Some of our newer devices have fail-safe protection features that resolve this issue. This specific device (CDCE18005) has an optional "fail-safe" setting for DC-coupled LVDS inputs, but from what I can tell it is intended to prevent the buffer from erroneously ingesting noise when there is no input, and not a protection mechanism against inputs being driven when the device is off. And if your input is AC-coupled LVDS it would not be applicable either.

    So I think that for this device, the inputs should not be driven when the device is off. I will check with my team tomorrow to be sure.

    Thanks,

    Evan Su