Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
In Digital Design and Computer Architecture (Harris and Harris), the following schematic is given , in discussing logic levels.
Why are the driver and receiver depicted as inverters?
Just for convenience. This is the simplest case, and the easiest to understand at the transistor level.
Required, but never shown