Before revision: In digital electronics three-state, tri-state , or 3-state logic allows an output or input pin/pad to assume a high impedance state, effectively removing the output from or three-state buffer is a type of digital buffer that has three stable states: a high output state, a low output state, and a high-impedance state.
After revision: In digital electronics , a tri-state or three-state buffer is a type of digital buffer that has three stable states: a high output state, a low output state, and a high-impedance state.