Patent ID: 6847230

Claim:
A method of implementing bi-directional level translation in an information handling system, said method comprising: coupling a first device port to the system via a first resistor to a first voltage; coupling a second device port to the system via a second resistor to a second voltage different from the first voltage; coupling the first device port to the second device port via a single bipolar junction transistor (BJT), the single bipolar junction transistor includes an emitter coupled to the first device port, a base coupled via a third resistor to the first voltage, and a collector coupled to the second device port, wherein the bipolar junction transistor operates as a bi-directional level translator between the first and second device ports; and selecting the first resistor and the second resistor values based upon load impedances and load capacitances, as well as, rise times required on the first device port and the second device port, wherein the third resistor value is selected as a function of the emitter current, VCC 1 , Vbc, Vil_max on the second port, and Vol_max on the first device port and a reverse Beta of the BJT at the lowest operational temperature.