It is for unconnected inputs. The voltage that the device uses defaults to 1 volt. It is set by a device parameter.Didn't know what pin that 'extra' pin was, so I assumed it was the supply pin. How shoul;d I draw it?
Either he doesn't know of or hasn't downloaded a library, like the one from Bordodynov, which has a symbol with correct parameters to model the behavior of CD4000 series chips.If you do not have a model of a CD4069 they why and how can you simulate a circuit that uses it??
They are behavioral models. You can read read the actual text files that implement them. Besides the logic functions they model propagation delay, rise time, fall time and voltage levels. In some cases they use the LTspice OTA devices and in other cases they use a combination of ideal components with generic parameters. Here is the one for the 4069. It uses two diodes, a resistor, a capacitor, two MOS transistors, one n-channel and one p-channel, and a final capacitor. What do you think?In your opinion, how accurate are these models? A 4069 for example?
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by Jake Hertz