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SN74LVC1G3157: Pspice model available for the SN74LVC1G3157 and SN74CBTLV3257

Jasmin Meloche
Prodigy 40 points
Part Number: SN74LVC1G3157
Other Parts Discussed in Thread: SN74CBTLV3257, , SN74LVC2G66-Q1

Hello. Can we have the Pspice model of the SN74LVC1G3157 and SN74CBTLV3257 devices?

HSpice can not be used with Tina nor Pspice TI tool!!

Regards.

  • 0
    TI__Mastermind 27088 points

    Hey Jasmin,

    Doesn't look like we have a PSPICE model for those devices available. Your best bet here would be to create a model using passive components and the specifications in the datasheet, i.e. RON and CON. 
    See our FAQ : 

    [FAQ] What if my Analog Switch/Multiplexer is Missing a PSpice Model?

    So for example on the SN74CBTLV3257 it would look something like the below. There isn't an explicit CON stated so I would just use the COFF on each side. Technically you could increase the 5.5pF by about 1 or 2 pF to get more accurate since the CON isn't exactly the COFF of the A side and B side together. Instead you'll have some extra conductor size added that would increase the capacitance. So you'd be doing COFF(A) + COFF(B) + C(extra) = CON. The 5ohms I pulled here is just the typ RON from the datasheet: 

    Thanks,
    Rami

  • 0
    Prodigy 40 points

    Hi Rami.

    Thanks for your reply. I already saw that answer. But for a full design review over different voltages of VCC and frequency, the behavior of a Caps + Resistor will not provide due diligent technical response. The internal mosfet and its bias will impact the overall performance which we need to simulate.

    Is there any other PSpice model available that use the same technology of analog mosfet as the one used in the SN74LVC1G3157?

  • 0 in reply to Jasmin Meloche
    TI__Mastermind 27088 points

    Hey Jasmin,

    I understand. Unfortunately the closest thing I could find was an unreleased model internally of the SN74LVC2G66-Q1 that only covers the 4.5V supply use case. I can't verify it's accuracy as it was created in 2013 and never released but it's the closest thing would have that is already created:

    SN74LVC2G66-Q1.zip

    I did find this E2E where it seems there was some success and instructions on the conversion
    https://e2e.ti.com/support/switches-multiplexers-group/switches-multiplexers/f/switches-multiplexers-forum/866703/sn74lvc1g3157-please-share-the-pspice-model-or-un-encrypted-model-of-hspice

    I believe currently the approach to converting HSPICE to PSPICE is a manual conversion. I'll continue looking into how to make such a thing possible but currently the HSPICE model looks to be encrypted so I'll have to dig around and see if I can find an unencrypted version to work with if the above doesn't work. 



    Thanks,
    Rami