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7. What are tri-state devices and why they are
essential in a bus oriented system?
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A tri-state device is normally a digital device. It means the device is in the high state, the low state, or in a high impedance state to prevent loading. The high and low states may have a fairly low impedance, anywhere from just a few ohms to 10 k ohms. The high impedance state would be in the megohms. An analog device would probably be either on or high state. There wouldn't be any real high or low states for analog as the output is continuously variable from 2 set limits.
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