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SN74LVTH244A: SPICE model integration issue with Multisim

Kyndal Sorenson
Prodigy 10 points
Part Number: SN74LVTH244A
Other Parts Discussed in Thread: TINA-TI

Hi,

I downloaded the .CIR model for SN74LVTH244A and I tried to import it into Multisim's component wizard. This allows me to create a new component using the SPICE model for simulation purposes. When I did that, I got this error (see image). The error would not allow me to continue. This issue could be a Multisim issue, but I though I would start with you guys first to see if there is an issue with the SPICE model. The version of Multisim I am using is 14.2.

 

  • 0
    TI__Guru* 96591 points

    Hi Kyndal,

    We test our models in Tina-TI (stated a few lines below your circled comment), but not in Multisim. I'm afraid I don't know much about that simulator, but it looks like it doesn't like having more than one subcircuit in the file, which Tina-TI and Cadence PSpice both don't have any issue with.

    You could try moving the subsequent subcircuits into the top level one to see if that would fix the issue for you.  If you aren't familiar with PSpice coding, this is the general structure of a PSpice file:

    * Comments start with asterisk
.SUBCKT Name_of_Block A B
* All lines inside the subcircuit block are components of the circuit
* Below is the definition of a resistor with name "R1" and value of 1kohm:
R1 A B 1k
.ENDS

    The PSpice model for SN74LVTH244A has multiple .SUBCKT .... .ENDS blocks, with the first just being a call to the second.