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TS3DDR4000: Can I use this device for MIPI DPHY signals?

Narender Singh1
Prodigy 60 points
Part Number: TS3DDR4000
Other Parts Discussed in Thread: TS5MP646

I wish to use TS3DDR4000 in place of TS5MP646 for my design that has MIPI DPHY signals. The datasheet is comparable and does tell me that DPHY signals will have no problems and will have an advantage with the higher BW of TS3DDR4000 . Am i missing something here ? Do you think there will be problems that I am not able to foresee. Also , i need a part with minimum 10 channels of inputs to  mux as DPHY has these ten lanes. 

Regards

  • 0
    TI__Expert 5660 points

    Hello,

    Thanks for your question and welcome to E2E!

    Key considerations for choosing a switch for any application are bandwidth, voltage requirements, configuration, and features. It is true that these switches are similar and likely suitable for your use case. If higher bandwidth is necessary, you may choose TS3DDR4000.

    However, I do recommend TS5MP646 for a size-optimized solution for MIPI with a wider voltage supply & I/O range. You may find that the two devices have similar active supply current, while TS5MP646 has a lower specification for power-down supply current.

    Please feel free to reach out if you have any additional questions. Let me know if this helps!

    Best regards,
    Kate

  • 0 in reply to Kate Dickson
    Prodigy 60 points

    Hello Kate, 

    Thanks for your reply. 

    In essence , TS3DDR4000  has 3.3 V for IO and TS5MP646  has 3.6V range . My DPHY signals are limited to 1.2V max , and the HS mode transmission is max of 400mV . Do you feel there could be a challenge here with TS3DDR4000  ? 

    Also , my concern was with the differential BW on TS3DDR4000  ? I will be running 2.5G data on DPHY differentially . And all these channels on the TS3DDR4000   are length matched ? I think they are .

  • 0 in reply to Narender Singh1
    TI__Expert 5660 points

    Hello,

    I do not see a concern as your DPHY signals are 1.2V and within the analog I/O voltage recommended operating conditions of both devices.

    The differential bandwidth characteristic of TS3DDR4000 (from the datasheet) is 6 GHz, which is plenty of margin for the 2.5 GHz DPHY signal. As this is a high-performing device for high speed signals, the skew between channels is very small, just 3 ps.

    As another note on TS5MP646, its differential BW specification is 4.1 GHz and its intrapair skew is only 1 ps.

    Both devices are likely suitable for your application, it is a design choice between these options depending on your preferences for size, cost, and power in your system.

    Best regards,
    Kate