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TS5MP645: Can two TS5MP645 devices be used to create 3:1 mipi switch

min zhou1
Prodigy 10 points
Part Number: TS5MP645
Other Parts Discussed in Thread: TS5MP646

We have a project that needs to implement 3 4lane MIPI inputs and 1 way 4lane MIPI through switch. Since there is no suitable 3:1 switch, we plan to implement 3:1 after using two 2:1 switch cascades.
Is it possible to use two 2:1 cascades (block diagram below)?
If there is a 3:1 MIPI switch to recommend, that would be great.if Without 3:1, if I use two 2:1 cascaded connections, the only thing we are not sure about is whether the chip supports the MIPI connection between the two TS5MP645 (circled in red below) (at the hardware underlying level).
Please help me confirm, thank you! MY EMAIL: summer@kstmicro.com

  • 0
    TI__Mastermind 45495 points

    Min,

    At the hardware underlying level there is no issue connecting two TS5MP645 devices in series.  The TS5MP64x devices are passive FET switches and simply pass the voltage from the drain of the FET to the source of the FET. 

    However, the issue you will need to pay attention to is there will be twice the parasitic on-state resistance and on-capacitance.  There will be two times the insertion loss and less total system bandwidth.  You may want to consider using the higher performing TS5MP646 device if you are cascading them.  The below post provides more information on the topic.

    Thank you,

    Adam