cant find a coomponent nor its multisim equivalent

[ngogketrao]

i am new  to multisim . currently working  on a timer circuit and  i wish to  implement it  with  CMOS 4026 (a decade counter and 7-segment display driver) . cant  anyone  tell how  fnd this component because  its unavailable in my component database or  some  component  with the same  functionalities.

[kittmaster]

You will have to check with the vendor of the device and see if they have a model for it. If not, there will be no way to simulate it.

If you only need a layout/footprint, then the modeling data is not needed.

Use the component wizard and the datasheet to get the destination.

[ngogketrao]

Hello!
Thank you for your answer, but i am afraid it doesn't solve my problem. In fact i have to design a counter circuit in Multisim and i have the obligation to use the CD4026 or an equivalent for simulation purpose. I have been looking everywhere but i don't seem to find it. Please can you advice me on how to find it or to use an equivalent model or an equivalent circuit?
 Thank you!

[kittmaster]

You would have to find a spice model or have someone build one for you to do what you ask. If you've never done device modeling, its a long and windy road to try for a first time out. If you manage to find someone to do it, expect it be be at least $500 or better to get the device model built.

You could try to build a subcircuit and use discrete components to create the model application. That would require you to find the datasheet and see if you can extrapolate from a block diagram to build the circuit via individual devices to create one master model and run the simulation that way.

If your religious, you can pray that someone may have created one privately in the past and provide you the needed files........but I think that chances of being struck by lightning on the day you win the megabucks lottery are greater.

Sorry I don't have a better response, but rule of thumb is......if its not in the NI databases, and the main company doesn't have the model available......your only choices are too create it yourself, or find an alternative.

If you promised a customer you can do it (or if this is homework/final project)......you just went from hot to scalding water.

Good luck

[lacy]

I have a 4029 in my database but it lists it just as a SYNC UP/DOWN BINARY/DECADE COUNTER. There is no mention of a seven segment driver. If you have this then you could cheat and add a seven segment driver to the outputs of this IC and create a working version of your particular IC for simulation purposes. If you need to transfer this later to Ultiboard you could them create a blank package and use it in the schematic to replace your "simulation model".

I will let you examine this chip and my procedure to see if it is suitable to your apllication. Let us Know if you do not have this IC and maybe we can post it in a schematic for you

Keep us posted on your progress.

[lacy]

Whoops. I didn't read your post good enough. You already said you didn't have this IC in your database so I am going to go ahead and post the schematic with  the ones I have.  There are 3 types: 15V, 10V and 5V versions. You may have to change the footprint for these when you go to transfer to Ultiboard.

Here it is:

[ngogketrao]

Good morning!

 Thank you for your reply, but I have to say that you made a little mistake in reading my question.I have Multisim Power Pro version, hence I have the 4029 in my database. But the one that I was asking about was actually the 4026 because I cannot find it in my database.

Have a nice day

[lacy]

Sorry, you are correct. the database skips right over it. The only way to simulate the function of your IC 4026 is to use a simular counter from the database and couple that with a seven segemnt decorder. That technique is the only way I know for you to simulate it without going through the trouble of making a new component and that depends on finding a spice model for the the 4026 which doesn't look promising.

Sorry about my mix-up with the numbers, but the technique outlined is still valid and may be your only hope.

[kittmaster]

Which is exactly what I said above......;)

[lacy]

Technically correct, but it sounded to me like you were advocating him creating one from the datasheet with discrete individual logic gates. This way he can bypass the discrete logic and just use 2 ICs in combo to create the same effect as this IC. If that wasn't the case then you should have been a little more clearer in your statement. Don't mean to sound cruel, but clarity is necessary for proper understanding (and I include myslef in this as I can be a little unclear in my eplainations sometimes).