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TS3USB221: USB2.0 FS SPDT mux

Mandan Kumar
Prodigy 195 points
Part Number: TS3USB221
Other Parts Discussed in Thread: TMUXHS221,
 we are looking for a 2 channel SPDT switch for USB application. The supported speed can also be 12Mbps as it is mainly required for debug purposes, so Full speed switches will also be good enough if this is saving some cost for us.
As I was looking through the portofolio- I saw  TS3USB221 to be more than enough for our requirements.
Can you recommend any favorable product for this application? If there are no USB FS specific switches then, USB HS switches will also do our work.
  • 0
    TI__Genius 13840 points

    Hi Mandan,

    What is the application for this mux? Is this for a new system, or are you looking to replace a competitor part with a TI mux?

    For our muxes, we do not have any FS-specific muxes, so I would recommend you to look at the TS3USB221 and the TMUXHS221. The TS3USB221 is one of our more popular muxes, and has different variations depending on ESD needs (TS3USB221A/E), while the TMUXHS221 is a newer device which has similar performance while coming in a different package.

    Please let me know if you have any other questions!

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Prodigy 195 points

    Hi Ryan,

    Sorry for the delay in the reply. I think the TS3USB221 device would be okay for us, also we will add external diodes to suppress ESD transients.

    This is a new application.

    We are trying to use the switch for providing the path for external USB connection for debugging of 2 processors in our PCBA and both of them are in device mode.

    I am attaching the config used for our use case. Can you check once and confirm if this is fine.

    I have a specific question - I am assuming that the switch is analog and does not differentiate on whether the Host/ Device end is connected to Pole end (D+, D-)or the Throw end (1D, 2D). Also the application is 12Mbps bit rate only. Do you foresee any issues with this configuration on the enumeration or signal attenuation/ losses? I have control of the VBUS SENSE of the both devices(processor 1&3) and I can enable and control both switches from Host device(Processor 2) only.

    I am attaching an image here. Please go through this.

  • 0 in reply to Mandan Kumar
    TI__Genius 13840 points

    Hi Mandan,

    Mandan Kumar said:
    I am attaching the config used for our use case. Can you check once and confirm if this is fine.

    This use-case looks fine to me, I don't believe there should be any issues with this use-case or setup you provided.

    Mandan Kumar said:
    I have a specific question - I am assuming that the switch is analog and does not differentiate on whether the Host/ Device end is connected to Pole end (D+, D-)or the Throw end (1D, 2D).

    That is correct, the mux needs to be switched by using an external signal, such as from an MCU or another GPIO.

    Mandan Kumar said:
    I have control of the VBUS SENSE of the both devices(processor 1&3) and I can enable and control both switches from Host device(Processor 2) only.

    So do you plan on using Processor 2 to control the select pins of both the muxes? If that is your intention and it will do what you need it to, then that should be fine.

    Please let me know if you need any clarification or if there are any other questions!

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Prodigy 195 points

    HI Ryan,
    Thanks! I will go ahead and close this thread for now.