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explain the tri-state buffer.
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the tri-state buffer is a type of digital logic circuit that uses three states rather than the two states used in traditional logic circuits. it is a circuit that has three possible states - high, low and high impedance or 'z' state.
the high impedance state allows the tri-state logic signal to be connected to multiple devices sharing the same input or output line while not transferring data. each bus line connected to the tri-state buffer can be driven 'high' or 'low', and when the tri-state buffer is in 'z' state, none of the three other states is active, thus allowing the other devices to control the bus line.
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