# 3-state buffer machanism

I read about the 3-state buffer. I do not precisely understand the working mechanism. It allows essentially to obtain a third state, that corresponding to the disconnection of the output from the circuit (eg. a bus).

• This disconnection of what exactly it consists?
• In what sense the corresponding Z high impedance state differs from the standard state 0 of ordinary output?
• Can we get a complete absence of current, when the buffer is active?
• If this is the case, how can that result be reached?