A power multiplexing circuit, comprising: a first supply selection circuit (212), comprising: a first power switching circuit (214) configured to receive a first supply power rail selection signal, the first power switching circuit configured to: selectively couple a first supply power rail having a first voltage to an output power rail coupled to at least one powered circuit, in response to the first supply power rail selection signal indicating a first supply power rail selection enable state; and a first diode drop control circuit) configured to receive a supply power rail switch signal, and establish a first diode connection between the first supply power rail and the output power rail, in response to the supply power rail switch signal indicating a supply power rail switch enable state; and a second supply selection circuit (212), comprising: a second power switching circuit (214) comprising a second supply power rail selection input configured to receive a second supply power rail selection signal, the second power switching circuit configured to: selectively couple a second supply power rail having a second voltage to the output power rail, in response to the second supply power rail selection signal indicating a second supply power rail selection enable state; and a second diode drop control circuit (220) configured to receive the supply power rail switch signal and establish a second diode connection between the second supply power rail and the output power rail, in response to the supply power rail switch signal indicating a supply power rail switch enable state. a first supply selection circuit (212), comprising: a first power switching circuit (214) configured to receive a first supply power rail selection signal, the first power switching circuit configured to: selectively couple a first supply power rail having a first voltage to an output power rail coupled to at least one powered circuit, in response to the first supply power rail selection signal indicating a first supply power rail selection enable state; and a first diode drop control circuit) configured to receive a supply power rail switch signal, and establish a first diode connection between the first supply power rail and the output power rail, in response to the supply power rail switch signal indicating a supply power rail switch enable state; and a first power switching circuit (214) configured to receive a first supply power rail selection signal, the first power switching circuit configured to: selectively couple a first supply power rail having a first voltage to an output power rail coupled to at least one powered circuit, in response to the first supply power rail selection signal indicating a first supply power rail selection enable state; and a first diode drop control circuit) configured to receive a supply power rail switch signal, and establish a first diode connection between the first supply power rail and the output power rail, in response to the supply power rail switch signal indicating a supply power rail switch enable state; and a second supply selection circuit (212), comprising: a second power switching circuit (214) comprising a second supply power rail selection input configured to receive a second supply power rail selection signal, the second power switching circuit configured to: selectively couple a second supply power rail having a second voltage to the output power rail, in response to the second supply power rail selection signal indicating a second supply power rail selection enable state; and a second diode drop control circuit (220) configured to receive the supply power rail switch signal and establish a second diode connection between the second supply power rail and the output power rail, in response to the supply power rail switch signal indicating a supply power rail switch enable state. a second power switching circuit (214) comprising a second supply power rail selection input configured to receive a second supply power rail selection signal, the second power switching circuit configured to: selectively couple a second supply power rail having a second voltage to the output power rail, in response to the second supply power rail selection signal indicating a second supply power rail selection enable state; and a second diode drop control circuit (220) configured to receive the supply power rail switch signal and establish a second diode connection between the second supply power rail and the output power rail, in response to the supply power rail switch signal indicating a supply power rail switch enable state.