, or boolean logic
, is the means by which digital electronic devices
. But in order for this to work, all the component
s 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 volt
ages interpreted as 'true
' or 'false
' (or 1
), as well as the supply voltages, will differ.