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why we don'r recommend use tri-state in the ic ??

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A.Anand Srinivasan

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because it is left open and hence there is a very good chance of noise coupling and hence leading to erroneous output...
 

carv_13

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Tri state devices have enable signals which can cause either a bus contention or a bus float fault. As a result when ATPG analysis is done on them, the logical values on these can result in the enable line faults being undetected.
 

xlxlyu

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it also has some power problem,
Tri state may casue pmos&nmos open at the same time,
so there is a direct paths from the supply to ground.
 

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