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TXS0104E: Need SPICE model

Kyndal Sorenson
Prodigy 20 points
Part Number: TXS0104E
Other Parts Discussed in Thread: TXS0101, TXS0102, TXS-EVM

Tool/software:

Hello,

Is there a SPICE model or equivalent I could use  for this device?

Background info: I have this device on a signal that is shared between two PCB boards. I am trying to model what happens when one board loses power and the other one does not. This signal goes from an MPSOC on one board to the TXS104E device to another MPSOC on the other board. We believe the MPSOCs internal ESD diodes on the power loss board are unintentionally pulling this signal low on both boards. Given that this device also had ESD diodes as evidence that the max output voltage rating on the datasheet shows Vcc+0.5V, I wonder if the same issue with occur? I am also wondering how the one-shot function will behave for this device if one board goes low and the other does not. 

If no equivalent spice model exists, could you help explain how I can best model this device?

  • +1
    TI__Mastermind 27951 points

    Hey Kyndal,

    This device does not support partial-power down mode. In the event that VCCA or VCCB becomes powered off and at 0V, the I/Os are not guaranteed to be high-Z (as of now, this feature is on the 1& 2 ch. configuration, TXS0102 and TXS0101). If possible, you can drive the OE pin low when one of the boards lose power to ensure the I/Os at a high-Z state. 

    There also isn't a PSPICE model for this device due to the internal one-shot architecture. This FAQ goes further in-depth explaining the reasons why. In any case, testing with the TXS-EVM under your system loads would provide much more accurate data. 

    Regards,

    Jack