Digital buffer

Directly connecting a low impedance load to a power source draws current according to Ohm's law.

One case of this is an inverting buffer which translates an active-high signal to an active-low one (or vice versa).

Decoders, state machines, and other sophisticated digital devices often include inverters.

Whether the output terminal sends off HIGH or LOW signal is determined by its input value.

[1] But when the control input is low (logic 0), the output is high impedance (abbreviated as "Hi-Z"), as if the part had been removed from the circuit.

Tri-State digital buffers also have inverting varieties in which the output is the inverse of the input.

Single input voltage buffers are used in many places for measurements including: Tri-state voltage buffers are used widely to transmit onto shared buses, since a bus can only transmit one input device's data at a time.