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Simulation of a Flip Flop JK in LTSpice.

Bastien Bertrand
Prodigy 165 points
Other Parts Discussed in Thread: CD4027B

Hello,

I want to simulate the CD4027B, but i don't have a model .lib or .cir for create the component. It will be created a card with this component and it would be desirable to simulate this function under LTSpice, a software which I know to use. I just miss the JK flip flop. Can you help me please? 

  • 0
    TI__Guru* 97046 points

    Hi Bastien,

    LTSpice is owned and licensed by a direct competitor to TI. It is explicitly not allowed for us to support their software (by the LTSpice EULA).

    As for a generic SPICE model - SPICE does not support digital circuits that include latches such as flip-flops. These circuits can produce unknown states and cause convergence errors in the simulator. Many simulators get around this by offering built-in digital functions.

    Is there some specific aspect of the JK flip-flop that I could help you to understand? What exactly are you trying to do?

  • 0 in reply to Emrys Maier
    Prodigy 165 points

    Hello Emrys,

    I completely understand about LTSpice. The operation of the JK switch is not a problem. I just wanted to understand the reason why there is no spice model at these flip-flops. I wanted to simulate an electronic function with the CD4027B component. But I understood that it was difficult to do so. If you have a digital logic circuit equivalent to this component to propose to me with your tools, I am taker.

    Translated with www.DeepL.com/Translator (free version)

  • 0 in reply to Bastien Bertrand
    TI__Guru* 97046 points

    Hey Bastien,

    I am currently working on a solution in PSpice for TI that will utilize the built-in digital gates and flip-flops so our customers can simulate those devices. Unfortunately, it will probably be several months before our first models for that will be released.

    I can put together a model + library for you to try out, but I can't make any promises on if it will even work without integration into the PSpice for TI libraries.