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Level shifter for Ethernet GMII interface

Kawai
Guru 19785 points
Other Parts Discussed in Thread: SN74AVC8T245

Hi Team,

We are asked for a level shifter which could shift to 2.5V/3.3V from 1.2V/1.8V. As customer will use the level shifter in the GMII interface, clock frequency would be 125MHz. I believe that SN74AVCxxT245 (xx = 8,16) series would meet the level shifter and clock frequency specification because SN74AVCxxxx D flipflop device supports up to 200MHz.

Could you advise us if there is a better solution than the above devices ?

We also appreciate it if you could tell us the limitations if there are any.

Best Regards,
Kawai

  • 0
    TI__Genius 14487 points

    Moving to Voltage Translation forum for better support.

  • 0
    TI__Expert 6430 points
    Hi Kawai,
    For SN74AVCXXT245, the data rate will depend on voltage supply and output load. For example, SN74AVC8T245 can support 170Mbps when VCCA is less than 1.8V and it can support 320Mbps when VCCA and VCCB is more than 1.8V under output load is less than 15pF. It is better to run some simulation with translation device IBIS model to make sure the translator performance.
    Thanks
  • 0 in reply to Wei Lang
    Guru 19785 points

    Hello Wei-san,

    Thanks for your advise. We will ask customer to run simulation with the IBIS model.

    Could you please tell me which process family could support high frequency ? Is AVC part the fastest ?

    It would be helpful if there is maximum frequency or data rate as a reference information in the product list at TI.com.

    Best Regards,
    Kawai

  • 0 in reply to Kawai
    TI__Expert 6430 points

    Hi Kawai-san,

    If higher voltage supply is less than 3.3V,  AVC parts are suitable device. If higher supply is less than 5V, please choose LVC parts. For AVC parts, when voltage translation is from 1.8V to 3.3V, 300Mbps can achieved under 15pF cap load.

    Thanks

    Wei

  • 0 in reply to Wei Lang
    Guru 19785 points

    Hello Wei-san,

    I understand, thanks for your great help.

    Best Regards,

    Kawai