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DP83848-EP: DP83848-EP unpowered but rest of board is powered

Jeffrey Lu
Prodigy 30 points
Part Number: DP83848-EP

Hello,

Are there any special requirements that need to be taken when power is removed from the Ethernet PHY device (DP83848-EP) but not the rest of the board? (ie disabling Ethernet functionality by removing power)

Is there a risk that noise can be picked up on the unpowered lines and be transferred to the surrounding interfaces (ie. RS422)? 

thanks,
Jeff

  • 0
    TI__Guru 62930 points

    Jeff,

    You must adhere to the Absolute Maximum Ratings section to prevent damage to the device.

    Of primary concern would be Vin, Vout ratings.  If VCC =0, then you cannot have any inputs (or outputs) biased to be less than -0.5V or greater than 0.5V.  This is due to the presence of ESD protection diodes.

    If this answers your question, please click "This Resolved My Issue"
    Regards,
    Wade