Patent ID: 7304524

Claim:
A data interface circuit comprising: a transmission section having a first pair voltage to current conversion element formed of a first voltage to current conversion element and a second voltage to current conversion element, and a second pair voltage to current conversion element formed of a third voltage to current conversion element and a fourth voltage to current conversion element; a first transmission line connected to said first voltage to current conversion element; a second transmission line connected to said second voltage to current conversion element; a third transmission line connected to said third voltage to current conversion element; a fourth transmission line connected to said fourth voltage to current conversion element; and a reception section having a first current to voltage conversion circuit connected to said first and second transmission lines, and a second current to voltage conversion circuit connected to said third and fourth transmission lines, wherein said first voltage to current conversion element passes current through said first transmission line toward said first current to voltage conversion circuit when a first input voltage signal as a binary signal reaches a first voltage level, said second voltage to current conversion element passes current through said second transmission line toward said first current to voltage conversion circuit when said first input voltage signal reaches a second voltage level, said third voltage to current conversion element passes current through said third transmission line toward said transmission section from said second current to voltage conversion circuit when a second input voltage signal as a binary signal reaches a third voltage level, and said fourth voltage to current conversion element passes current through said fourth transmission line toward said transmission section from said second current to voltage conversion circuit when said second input voltage signal reaches a fourth voltage level, said first current to voltage conversion circuit converts current passing through said first and second transmission lines into only a single first output voltage signal to output, and said second current to voltage conversion circuit converts current passing through said third and fourth transmission lines into only a single second output voltage signal to output.