HiYes, I use the cd4093B model from Yahoo group. Could you please tell me how to set the negative power supply instead of ground?
Just change the spiceline attribute values to the supply node names.
VDD 0 <<<<change this
VDD VSS <<<<to this
Make sure supply nodes VDD and VSS exist.
Here's a view of the properties for the CD4093B, The SpiceModel attribute has been changed: