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ibis simulation for pspice

WooJin Yang
Prodigy 70 points

Other Parts Discussed in Thread: SN74AUP1G97

Hello.

I want to simulate the model sn74aup1g97 with pspice.

I converted the .ibs file of sn74aup1g97 and insert it like the picture below.

And simulation result is like above.

I want to get the inverter waveform as like figure 8 in the datasheet.

however, i don't know how to use this simulation model as an inverter.

I want to ask some advices

  • 0
    TI__Mastermind 20460 points
    Hi WooJin,
    IBIS doesn't support modeling of the internal behavior of the device. It is strictly for modeling the Input and Output buffer behavior. If you wanted to model the internal behavior, you could add an ideal inverter before the IBIS model. That way, you'd be able to model the buffer output properly, and the state as well.
    Regards,David LarkinWebench Design Center
  • 0 in reply to David Larkin
    Prodigy 70 points
    Thank you for your reply, and one more question.
    In model schematic, there is no Vcc or Vdd port, however, we want to calculate the input current through total circuit and SN74AUP1G.
    Is there any way to calculate input current or power consumption of SN74AUP1G in simulation?
  • 0 in reply to WooJin Yang
    TI__Mastermind 20460 points

    No, there is no way to calculate power consumption or input current through VCC/VDD with an IBIS model. The datasheet specifies max current through VDD at 50 mA. The max output current is listed as 4mA at 3V in the recommended operating conditions table. The outputs must not be very strong, and they operate at only 10 MHz max speed. The 4mA is a static measurement, but I doubt that the shoot-thru current will be very high. Probably another 4mA worst case. I suspect the 50mA max  in the absolute maximum ratings table is heavily guard-banded and that a typical value will be around 10 mA at 10 MHz. That's a guess though, not based on simulations or measurements.

    If the power consumption is critical in your design, you can order a sample and measure on a simple breadboard.

    Hope this helps,

    David