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DP83849I: characteristics impedance of MDC、MDIO,CLK2MAC

Part Number: DP83849I

Hello Experts,

My customer has question as follows. Would you answer it, please?
[Question]
Customer is now designing PCB layout and customer would like to know the characteristics impedance of MDC, MDIO, CLK2MAC lines. Does those lines have any requirement/recommendation  of the characteristics impedance?

Best Regards,
Fujiwara

  • Hi Yasushi,

    MDC, MDIO, and CLK2MAC prefer 50 ohms characteristics impedance. There is no strict requirement for MDC and MDIO trace. CLK2MAC for MII,RMII, or RGMII communication normally 50ohms is highly prefer. 

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    Regards,

    Hillman Lin