Bi-directional voltage translator

A bi-directional voltage translator comprising:

• a step-up voltage translator connected to a wire for converting signals on said wire having a first voltage level to signals of a second voltage level, wherein said step-up voltage translator includes a first source sense circuit, a first block feedback circuit and a first output driver circuit, wherein said first source sense circuit detects a voltage across a resistor, and if a voltage across said resistor is positive, then said wire is driven low by a device coupled to said wire;
• and
• a step-down voltage translator for converting signals of said second voltage level to signals of said first voltage level, wherein said step-down voltage translator includes a second source sense circuit, a second block feedback circuit and a second output driver circuit, wherein if said voltage across said resistor is negative, then said wire is driven by said second output driver circuit.