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NE555: Simulation model not available

ArTzy
Genius 17425 points
Part Number: NE555
Other Parts Discussed in Thread: TLC555, LM555,

Hi Experts,

Good day. Seeking your assistance on this query.

I have downloaded the PSPICE for TI but there only TLC555 model is available which is CMOS version but NE555p is a BJT version.

Since the TLC555 is a CMOS version of the 555 timer so it won't be of help. Will it be possible to provide a transistor level schematic of the NE555p timer preferably along with the dimensions of the transistors (i.e. emitter length and width) and resistance values?

The transistor level schematic is available for LM555 in its datasheet (although the transistor parameters of it are not provide) but the same is not available for NE555p.

Thank you.

Regards,
Archie A.

  • 0
    TI__Mastermind 25080 points

    Archie,

    We wouldn't be able to provide that level of detail on our designs, however there is a model built within Tina Ti. In the below image you can see under the Semiconductor section that there is a 555 timer. You can double click on it to change the type to the NE555. The TLC555 is the only component level model we currently have. Tina Ti is a free download we provide in the following location:

    https://www.ti.com/tool/TINA-TI

    If you have questions on how to use Tina I can assist you. 

    Best Regards,

    Chris Featherstone

  • 0 in reply to Chris Featherstone
    TI__Genius 17425 points

    Hi Chris,

    Thanks for this information.

    We have checked the TI-TINA software too but again it doesn't give us the transistor level information and parameters for modelling. We require this information because we need to know the current values within the NE555 timer circuit at each transistor and resistors.

    But as you mentioned its not possible for TI to share these information with us, so is it possible for you to verify whether the attached SPICE model for the LM555 is correct i.e. can we use it to simulate and compare the results with real LM555 timer? It was provided as an example with the Ngspice software.

    Hope to hear your feedback.

    Thank you very much for your usual support.

    Regards,
    Archie A.

    555-timer-2.zip

  • 0 in reply to ArTzy
    TI__Mastermind 25080 points

    Archie,

    Extracting all of the information for verification would be very difficult. We don't have active designers on this product since it was released almost 50 years ago. We have moved on from component level simulations and our simulations are macro behavioral models that run much faster and have far less convergence issues. We are unable to verify or support a model that is developed outside of the company. Sorry for the inconvenience. 

    Best Regards,

    Chris Featherstone