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TMUXHS221: What will happen to Signal on Data line in the "5V-Area"

Oliver Großmann
Prodigy 10 points
Part Number: TMUXHS221

Tool/software:

Hi,
As the TMUXHS221 is 5V tolerant on Data Pins (abs max. 5.5V), it is our selection for switching two USB 2.0 connectors to the CPU. 
As the block diagram shows a charge pump for the analog switches, I assume signals above 3.6V are just forwarded and not clipped by the switch, or is there any clipping of signals between 3.6V and 5.5V expected due to the voltage level of the internal charge pump?

Our CPU has abs max. the voltage on data pins is 3.73V. If the MUX is limiting the voltage on the Data lines from DA/DB to D to max. 3.73 we can skip the protection between the MUX and CPU.

Can you please tell me the transfer behavior between 3.6V and 5.5V on the Data pins in Direction DA -> D and DB-> D?

Many thanks and best regards.

Olli

  • 0
    TI__Mastermind 18135 points

    Hello Olli,

    The recommended operation conditions of the TMUXHS221 is up to 3.6V.

    Absolute Maximum Ratings do not imply functional operation of the device. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.

    I cannot guarantee or predict device functionality above the operating conditions. 

    A better option might be the TS5USBC41. It has overvoltage protection up to 24V, which is a bit of an overkill but it is the best option we have for this application. It can handle voltages above 3.6V on the I/Os without the risk of damaging the part.

    Thanks,

    Nir 

  • 0 in reply to Nir Gilgur
    Prodigy 10 points

    Thanks for your clarification Nir.
    The MUX switches with integrated OVP are no option as they have all the OVP on the wrong side. In our case we switch one CPU Port to 2 USB Jacks. As the 5V case is just an very unlikely error case the 5V-tolerant statement with the abs. max. Rating of 5.5V is OK. But we must protect the CPU. An option could be to use a TPD2S701 between MUX and CPU or to build it discrete. 

    Best regards,

    Olli