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Computing (FOLDOC) dictionary
tri state
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hardware A feature of some digital electronic devices
which allows a connector (pin) to either act as a normal
output, driving a signal onto a line, or to be "tri stated" -
set to a high-impedance ("high Z") condition. This allows
other outputs to drive signals onto the line. Often the same
connector also functions as an input when its output circuitry
is tri stated.