It is an object of the invention to provide {TAIL ~ a data input/output circuit} which has a simple circuit arrangement capable of adjusting {HEAD ~ the output impedance} of the transmitting path, and which can be small sized 
It is an object of the invention to provide { TAIL ~ a data input / output circuit } which has a simple circuit arrangement capable of adjusting { HEAD ~ the output impedance } of the transmitting path , and which can be small sized
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