Methods and apparatus for providing a bus interface are disclosed. An example bus interface includes a first power supply bus configured to distribute a first power supply voltage to first circuitry during a normal operating mode of the bus interface and power off during a low power operating mode of the bus interface. The example bus interface also includes a second power supply bus configured to distribute the first power supply voltage to second circuitry during the normal operating mode and distribute a second power supply voltage to the second circuitry during the low power operating mode. The example bus interface further includes a selection device coupled with the first power supply bus and the second power supply bus, where the selection device is configured to transition the bus interface between the normal operating mode and the low power operating mode in response to a received signal.