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TCA9545A: Question on the IBIS model

Xiaoying Lu
Expert 4280 points
Part Number: TCA9545A
Other Parts Discussed in Thread: PCA9306

Hi team,

Pls help on the question from my customer,

I download IBIS model of TCA9545A from TI website, and I’m a little confused about it. In datasheet, there is switch on-state resistance characteristics, and it means that signals input and go through this component and output just like go through a resistor. The block diagram below also means that. But in IBIS model, there are pins assigned input and output, so that it is independent from input and output pin in simulation. Could your team share with us the S-parameter model of TCA9545A just like some multiplexers? And when we use TCA9545, what happened inside, if signals go through this component and output or this component receive signals and redrive them?
Thanks a lot.

Regards,

Xiaoying

  • 0
    Guru 316920 points

    The INTZ model is for the various digital input pins.
    The INTZ_OP model is for the open-drain interrupt output.
    The SCL pin is a digital input; the SDA pin is both an input and an open-drain output. These two models are only for the TCA9545A's internal I²C slave; they do not model the switch connections.
    The eight slave channel pins (SCx, SDx) have model "NC", i.e., they are not modelled.

    I²C signals are not high speed. You can simply model the switches as resistors.

  • 0
    TI__Guru 73061 points

    Hi Xiaoying,

    As Clemens has pointed out a lot of these models for this device are generic digital outputs. You probably want a series model which we don't have an IBIS model for this device. I think a workaround is to try to use the PCA9306's series models to run simulations on. Those models will treat the channels like pass FETs which is how the 9545 works.

    -Bobby