I"m trying to know what is the use of tri-state output and also what is the benefit of making use of it.

You are watching: What is tri-state logic?

Below depicts both two-state and tri-state output:

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According to the over logic, it seems to me two-state output have the right to only it is in ON or OFF.But in tri-state case, the output have the right to be ON, off or floating. So to me the only distinction is the floating state.

As far as i read, floating signals are not useful. But it appears I"m ignorant at some points and also want to ask what is the function of utilizing tri-state output?


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Tri-state is basically 3 various states together you have seen. Instead of calling that ON and also OFF, think the it as IN and also OUT instead. The third state is no floating, it is in a high impedance state, i m sorry is essentially disconnecting it from the circuit. This way your 3 claims are:

InputOutputHigh Impedance (disconnected)

This is really useful in circuits that have a typical bus because that multiple components. V tri-state logic, components can either check out from the bus, compose to the bus, or be essentially disconnected so the it walk not affect the bus, and also will not be impacted by the state that the bus either.

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As an example of making use of tri-state reasonable is top top a computer bus:

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(Picture taken indigenous http://www.lisbdnet.com/system-bus-functions-features/)

As you can see, multiple units space sharing the same busses. You don"t desire the info on the bus come be check out by every unit at the very same time. You additionally dont desire them composing to the bus in ~ the very same time. V Tri-state logic, each individual unit have the right to either review from the bus, compose to the bus or simply be disconnected. In this way, data can be sent back and forth and also only the units that call for the info will obtain it. Imagine, through the over diagram, you get an intake to access a storage address, i m sorry then needs to be sent to a register, then go with the ALU, and also finally the data is sent out to the output. This deserve to be done easily by transforming the between the 3 states, so just the systems that are essential will be linked to the bus at any time.