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