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TXB0104-Q1: Recommended range of dumping resistor for noise reduction

RYO
Intellectual 2000 points
Part Number: TXB0104-Q1

Hello all,

Thank you for your support always.

I would like to know the recommended range of dumping resistor for TXB0104-Q1. Now, our customer puts 100Ohm on each input/output pin. Also, I would like to know this is effective or not because 4k-Ohm resistor is placed on the output of drivers in the functional block diagram.

Best regards,
RYO

  • 0
    TI__Guru 62160 points
    Hi Ryo,

    What is the purpose of the dumping resistors in the customer's application? I assume that these are series resistors on the traces.
    Are there overshoots/ undershoots on the signals?
  • 0 in reply to ShreyasRao
    TI__Intellectual 2000 points

    Hello Shreyas,

    Thank you for your response. The resistors are used for noise reduction on the IO lines. I'm not sure the difference between the dumping resistors and series resistors. I'd like to know the range of the resistance for this device. The assumed resistors are like below:

    Thank you,
    RYO

  • 0 in reply to RYO
    TI__Guru 62160 points

    Hi Ryo,

    Got it, thanks for the representation done.

    I would prefer to have a series resistor range of 20-50ohm depending on the output ringing and data rate support required.

    Having an IBIS model to determine the series resistance is another option depending on the system.

    The IBIS model can be found here.

  • 0 in reply to ShreyasRao
    TI__Intellectual 2000 points
    Thank you. Is recommended resistance of 20-50ohm due to data rate? The used data rate at this time is 1Mbps.
    Also, are there any pulldown resistors on OE? Should I put a pulldown on the pin?
  • 0 in reply to RYO
    TI__Guru 62160 points
    RYO,
    OE pin can have a pulldown to have a default state. however, it can also be tied to gnd without one. The OE is high input impedance CMOS input and hence will have low leakage by default.