Data Sheet

LABCENTER ELECTRONICS LTD.
74
Hit the OK button when you are finished.
You may have noticed that there is a significant omission from the schematic part as we have
drawn it so far, namely that there are no physical power pins on the device. Since we do not
need to wire power nets explicitly we do not need a physical pin for the component. We need
only ensure that the power pins are handled correctly with respect to the physical PCB footprint
and we’ll discuss this in more detail in the next section. It is worth noting however, that while it is
very common to have non-physical power pins in order to reduce clutter on the schematic, you
may have a preference for everything to be explicitly wired. In this case you could simply add
two extra pins and name them VDD and VSS respectively.
Our final task now is to make a device from the composite graphics and pins that we have
placed. Start by drawing a tag box around the entire graphic (right depress the mouse and drag
the selection box). Next, right click the mouse inside the selection box and select the Make
Device option from the resulting context menu.
Make Device icon and the Context menu option