Digital logic, or
boolean logic, is the means by which
digital electronic devices handle
data. But in order for this to work, all the
components of the device must interpret the same signals in the same way.
In each logic family, the
basic building blocks of each device are the same. In
CMOS, this building block is the
MOS transistor.
Devices belonging to different
logic families cannot usually be connected without an
interface, since the
voltages interpreted as '
true' or '
false' (or
1 or
0), as well as the supply voltages, will differ.