Hello,

I am wondering if we can run simulation using HEF4021B.

https://assets.nexperia.com/documents/data-sheet/HEF4021B.pdf

Can we simulate in LT Spice if SPICE model if available for HEF4021B ?

 

I am wondering if we can run simulation using HEF4021B.

Do you want to do a logic simulation? Or circuit simulation?

If you want to do a logic simulation, a logic simulator would be a much better option. In addition to being able to easily check logic levels, you can generate timing diagrams.

 

Can we simulate in LT Spice if SPICE model if available for HEF4021B ?

Yes.
My CMOS LTspice library does not have the 4021.

 

The LTspice Users's Group does not have it
@Bordodynov does not have it
The Nexperia website does not have it.

Your chance of finding one are greatly diminished.

 

I have a CD4014 that is almost the same as the CD4021.
I can convert it if specifically requested.

 

Yes, I actually want to perform logic simulation using a logic simulator. Which logic simulator can be used ? Please give me suggestion. Thanks in advance.

 

I have a CD4014 that is almost the same as the CD4021.
I can convert it if specifically requested.

I'd like to add the '4021 model to my library if you have such a thing, please.
Peter

 

Yes, I actually want to perform logic simulation using a logic simulator. Which logic simulator can be used ? Please give me suggestion. Thanks in advance.

• logic only - or a mixed (with analog) simulation ?
  • how many power sources ? ← may affect the ¹initialization of the simulation + more
    • are there multiple isolated grounds ? ← requires the Vss for logic to be at the global GND
  • is there any inductors in the circuit/simulation ? ← will slow down or compromise the thing (also ¹ ↑ )

implementing it with ARBITRARY STATE MACHINE might give the best performance - but requires quite good expertise at LTspice

 

the CD4021's model using subcircuit (.asc) which uses netlist (.cir) // -- it's not good to resolve timing/latency issues

assumes the Vss is the global reference ground (GND) and the supply is +5V

 

I'd like to add the '4021 model to my library if you have such a thing, please.
Peter

Hello...sorry it took so long but I have CD4014B and CD4021B models completed.
I am attaching a zip file for each.
Please note you will need the CD4000_v.lib file from the LTspice groups.io Group to use these models.

 

Hello...sorry it took so long but I have CD4014B and CD4021B models completed.
I am attaching a zip file for each.
Please note you will need the CD4000_v.lib file from the LTspice groups.io Group to use these models.