![]() ![]() Off, leaving the receiving gate floating. V IH V cc -Īnother equation is used for the case when all the Tri-State devices are Because only one Three-State output should beĪctive at any given time the calculation for the pull-up resistor is the Devices with Three-State outputs may beĬonnected in parallel. Additional names for Tri-State include High-Impedance State, or Off-State. Valid logic level so the output remains fixed at a valid voltage level Tri-State Output pins should be tied to a While in the off-state the IC will neither sink current or source current, the outputs just represent a high impedance condition. When the IC is placed in the 3rd state, neither transistor is conducting and is said to be in the off-state. Normally an ICs output is either high or low, depending on which of the output transistors is on and conducting. ![]() Normally the two transistors that make up the output circuit of a transistor will function in opposition, one is conducting while the other is not. ![]() Output enable lines are control lines that allow the Totem Pole Outputs to function as normal, or shut them both off depending on the state on the control line. ![]()
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