User Guide

Specifying Part Packaging Information
201
Specifying Part Packaging
Information
If you are going to use a symbol for PCB layout, you will
need to specify package or device information.
Package information consists of:
• the number of gates per package
• a list of package types (footprints) where the device is
available
• one or more pin assignment lists
• functionally equivalent pins that can be swapped in
layout
Package information is used by PSpice Schematics to
package together gates and to generate layout netlists.
Pin Assignment Lists
A pin assignment list is a list of physical pin number
assignments for each package type in which a device is
available. Because a device may be available in several
package types (DIP14, LCC20, and so on), and each may
have different pin number assignments, a single package
definition can contain more than one pin assignment list.
Each pin assignment list is associated with a list of
package types (footprints) that the pin number
assignments are valid for.