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A tri-state buffer is similar to a buffer, but it adds an additional “enable” input that controls whether the primary input is passed to its output or not. If the “enable” input signal is false, the tri-state buffer passes a high impedance (or hi-Z) signal, which effectively disconnects its output from the circuit.
The tristate buffer, shown in Figure 2.40, has three possible output states: HIGH (1), LOW (0), and floating (Z).
tri-state output (three-state output) An electronic output stage consisting of a logic gate, commonly an inverter or buffer, that exhibits three possible logic states, namely logic 1, logic 0, and an inactive (high-impedance or open-circuit) state.
The Tri-state Buffer is used in many electronic and microprocessor circuits as they allow multiple logic devices to be connected to the same wire or bus without damage or loss of data.
“A logic gate in a microchip is made up of a specific arrangement of transistors. For modern microchips, the transistors are of the kind called Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), and the semiconductor used is silicon.
“Tristate” means a state of high impedance. A pin can either pull to 0 V (sinking current, generally), pull to 5 V (sourcing current, generally), or become high impedance, like an input.
The Tri-state function would allow output pin to assume high-impedance state, effectively removing the oscillator output from the circuit. Oscillator circuits can remain on or be turned off while output is disabled in Tri-State. Page 3. TAITIEN. OUR PERFORMANCE, YOUR REPUTATION.
|Que.||When a tri-state logic device is in the third state, then:|
|b.||it does not draw any current|
|c.||it draws very high current|
|d.||it presents a low impedance|
|Answer:it presents a low impedance|
When the control input is equal to 1, the output is enabled and the gate behaves like any conventional buffer, with the output equal to the normal input. Because of this feature, a large number of three-state gate outputs can be connected with wires to form a common bus line without endangering loading effects.
Resistance is a concept used for DC (direct currents) whereas impedance is the AC (alternating current) equivalent. Resistance is due to electrons in a conductor colliding with the ionic lattice of the conductor meaning that electrical energy is converted into heat.
High impedance inputs are preferred on measuring instruments such as voltmeters or oscilloscopes. In audio systems, a high-impedance input may be required for use with devices such as crystal microphones or other devices with high internal impedance.
Often abbreviated as “Hi-Z,” this generally refers to electronic audio devices with and input or output impedance of more than 600 ohms. A typical electric guitar pickup, for example, generally needs to be connected to a high-impedance input.
The increased resistance may be caused by a variety of factors, including corrosion, loose connections, and damaged conductors, for example.
3. High impedance fault detection techniques