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DP83826E: DP83826 – CEXT & Power Sequencing Clarification

Jefin George
Prodigy 100 points
Part Number: DP83826E

Tool/software:

We are designing an Ethernet switch where the DP83826 is implemented as the Ethernet PHY for the upstream interface. During the circuit design, we have a couple of doubts that need clarification:

  1. Should the CEXT pin be connected to a 2 nF capacitor, as specified in the datasheet?

  2. Please review the attached schematics. Should we strictly follow the power-up sequencing as mentioned in the datasheet?

Your guidance on these points will help us proceed with the design confidently.

  • 0
    TI__Genius 13266 points

    Hi Jefin, 

    Jefin George said:
    Should the CEXT pin be connected to a 2 nF capacitor, as specified in the datasheet?

    Yes, it should be connected to 2nF capacitor. 


    Jefin George said:
    Please review the attached schematics. Should we strictly follow the power-up sequencing as mentioned in the datasheet?

    Yes, we recommend to strictly follow the power-up sequencing of possible. 

    Are the MDI lines meant to be connected to the NC pins of the ESD diode?

    Best,
    J