Patent ID: 8621247

Claim:
A bus interface comprising: a first power supply bus coupled to a single voltage source and a first circuitry, the first power supply bus configured to: distribute a first power supply voltage from the single voltage source to the first circuitry during a normal operating mode of the bus interface; and power off and decouple the first circuitry from the first power supply bus during a low power operating mode of the bus interface; a second power supply bus coupled to the single voltage source and a second circuitry, the second power supply bus configured to: distribute the first power supply voltage to the second circuitry during the normal operating mode; and distribute a second power supply voltage to the second circuitry during the low power operating mode; a selection device coupled with the first power supply bus and the second power supply bus, the selection device being configured to transition the bus interface between the normal operating mode and the low power operating mode in response to a received signal; and the single voltage source configured to: provide the first power supply voltage in the normal operating mode; and provide the second power supply voltage in the low power operating mode.