Patent ID: 7411416

Claim:
A data bus circuit that connects a first device driven by a first voltage and a second device driven by a second voltage, wherein the first voltage and the second voltage are different, comprising: a data bus that electrically connects the first device and the second device; a Thevenin termination circuit that is arranged on the data bus at a point that is anywhere between the first device and the second device, wherein the Thevenin termination circuit has a configuration so that a voltage at the point is substantially equal to the first voltage; and a bypass condenser that is connected in parallel with the Thevenin termination circuit between the high voltage terminal and the low voltage terminal, wherein the Thevenin termination circuit includes a first resistance provided between the point and a high voltage terminal and a second resistance provided between the point and a low voltage terminal, wherein resistances of the first resistance and the second resistance are determined based on a ratio of the first voltage and the second voltage so that the voltage at the point is substantially equal to the first voltage, wherein the data bus includes a plurality of signal lines, and the Thevenin termination circuit and the bypass condenser are provided corresponding to at least one of the signal lines, wherein the data bus includes 16 signal lines, and the Thevenin termination circuit and the bypass condenser are provided corresponding to 8 signal lines.