Patent ID: 6911860

Claim:
A switch circuit for selectively providing a reference voltage signal to a logic device that receives an input/output supply signal and is operable in accordance with any one of a plurality of input/output standards, wherein at least one of the plurality of input/output standards is a voltage referenced standard, the switch circuit comprising a transmission switch circuit receiving the reference voltage signal at an input thereof and passing the reference voltage signal to an output thereof in response to a first control signal, the first control signal having a logic level determined by a dedicated supply signal, the dedicated supply signal being different from the input/output supply signal received by the logic device, and a first logic level shifting circuit receiving a master control signal at an input thereof, the master control signal being provided by a logic core of the logic device and having a first logic level determined by a core supply signal, the first logic level shifting circuit further receiving the dedicated supply signal and providing the first control signal at an output thereof.