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DS250DF410: DS250DF410ABM

jugal kishore Bhandari
Prodigy 20 points
Part Number: DS250DF410

Tool/software:

I’m planning to use three DS250DF410 retimers to handle 12 differential channels at 25 Gbps each (4 channels per device).

I have a few questions:

  1. Can I use all three devices together on the same board without any issues?

  2. How should I set the I2C addresses to avoid conflicts?

  3. Do the devices need to share a reference clock, or can they work independently?

  4. Any tips on power sequencing or layout when using multiple retimers?

  5. Are there recommended default settings (CDR, CTLE, etc.) for 25 Gbps links?

Please let me know if there are any reference designs or documents that can help.

  • 0
    TI__Mastermind 20901 points

    Hello Jugal,

    Thank you for reaching out with your inquiries on the DS250DF410.

    The engineer supporting these devices will be able to help address your questions by the middle of this week.

    Best,
    David

  • 0 in reply to David Waier
    TI__Mastermind 36533 points

    Hi Jugal,

    1. Can I use all three devices together on the same board without any issues?

      1. Yes

    2. How should I set the I2C addresses to avoid conflicts?

      1. You can use different I2C addresses to avoid addressing conflicts if the retimers are on the same I2C bus.

    3. Do the devices need to share a reference clock, or can they work independently?

      1. The devices can use independent reference clocks.

    4. Any tips on power sequencing or layout when using multiple retimers?

      1. The retimers just have a single 2.5V supply.  I think this makes sequencing easier.  In general, there are not any critical power sequencing steps I'm aware of.
      2. For layout, please take a look at the layout guidelines and example in the data sheet.

    5. Are there recommended default settings (CDR, CTLE, etc.) for 25 Gbps links?

      1. I'd recommend reviewing some of the example configurations in the retimer programming guide.
      2. By default, the retimer will lock to 25.78125 Gbps data using "adapt mode 1".
        1. Adapt mode 1 automatically adapts CTLE during CDR lock process.

    Thanks,

    Drew