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TUSB542: Inquiries about the application circuit

JH Shin
Guru 11510 points
Part Number: TUSB542


Hello,

My customer has some questions about the following TUSB542 application circuit in the TUSB542 datasheet.

The customer thinks this is a float setting when using a 4.7k pull-up/donw resistor on the B2 pin. Is that correct?

Why is the 4.7kohm pull-up/down register used only for B2 pin among the CNFG pins?

Thank you.

JH

  • +1
    TI__Guru**** 181321 points

    JH

    The connections for CNFG pins of TUSB542 is example only.

    Refer to Table 2 and section 6.6 Electrical Characteristics, DC, floating voltage means VCC/2. So having both pullup and pulldown resistor will result in VCC/2 -> Floating.

    It is recommended to run an overall system signal integrity analysis, in order to estimate the channel loss and configure the re-driver. It is also recommended to have pull-up and pull-down option on all the configuration pins for debug and testing purposes.

    Thanks

    David