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SN74LV123A PSpice modeling

Alex Oren
Intellectual 480 points
Other Parts Discussed in Thread: SN74LV123A

I'm using the SN74LV123A PSpice model from TI site.

It works as expected when using small Cext of e.g. 150pF. The voltage on the capacitor drops from 4.983V to ~1V when triggered.

After changing the Cext to 1uF the voltage on the capacitor is changing from 4983V to 4.982V and nothing happens.

What am I missing here?

The circuit and waveform attached. 

Thanks,

Alex

SN74LV123A simulation issue.pdf

  • 0
    TI__Guru* 97046 points
    This model was created for a very specific version of Cadence (16.2 I believe), and has had trouble on other simulators. I am currently talking with our model creation/simulation team to find out if there is anything we can do and will be happy to update you when I have any additional information.
  • 0 in reply to Emrys Maier
    Intellectual 480 points
    Thank you for the prompt response, I will wait for an update from the model team.
    If there are any other models of any retriggerable multi vibrator that are available for PSpice 16.6 this also can help.