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TUSB2046B Ferrite Bead Specifics

stephen vincent
Prodigy 110 points
Other Parts Discussed in Thread: TUSB2046B

I am laying out a 4 port USB hub using the TUSB2046B with a Bus-Powered configuration and ganged-port power management similar to Figure 11 in the TUSB2046B data sheet.  I see that the datasheet calls for ferrite beads on the GND and 5v Ports of the downstream ports. 

Do you have any advice on ferrite bead selection?

  • 0
    TI__Mastermind 18655 points

    Hello Stephen,

    In our EVM, we used the 240-2435-2-ND ferrite bead from Digi-Key.

    http://www.digikey.com/product-search/en?vendor=0&keywords=240-2435-2-ND

    The     TUSB2046B requires a Power-on Reset pulse of between 1ms to 3 ms after 3.3-V VCC reaches its 90%. This can be done with a simple RC circuit (15K pull-up resistor and 1 uF cap).

    Regards,

    Joel