Circuit and method of operating the same

A circuit comprising:

• a power control circuit coupled to a first voltage supply having a first voltage and a second voltage supply having a second voltage, the power control circuit configured to generate a first output control signal, a second output control signal and a third output control signal in response to a first control signal and a second control signal, at least the first voltage or the first control signal having a first voltage swing, and at least the second voltage or the second control signal having a second voltage swing different from the first voltage swing, the first control signal causing the power control circuit to enter a power management mode having a first reduced power state and a second reduced power state;
• a first header circuit coupled to the power control circuit, and configured to supply at least a first supply voltage, a second supply voltage or a third supply voltage in response to at least the first output control signal, the second output control signal or the third output control signal;
• and
• a memory cell array coupled to the first header circuit, configured to receive the first supply voltage, and being in the first reduced power state or the second reduced power state in response to the power control circuit entering the power management mode;
• wherein the power management mode includes the second voltage supply being turned off;
• and
• wherein the power control circuit comprises:
• a second header circuit coupled to the first voltage supply and the second voltage supply, and configured to supply the first voltage of the first voltage supply to a first voltage supply node in response to the first control signal, and to supply the second voltage of the second voltage supply to a second voltage supply node in response to a first level shifted signal, the first level shifted signal is a level shifted version of the first control signal.

A method of operating a circuit, the method comprising:

• generating, by a power control circuit, a first output control signal, a second output control signal and a third output control signal in response to at least a first control signal, a second control signal or a third control signal, the power control circuit being coupled to a first voltage supply having a first voltage and a second voltage supply having a second voltage, at least the first voltage or the first control signal having a first voltage swing, and at least the second voltage, the second control signal or the third control signal having a second voltage swing different from the first voltage swing;
• supplying, by a first header circuit, at least a first supply voltage, a second supply voltage or a third supply voltage in response to at least the first output control signal, the second output control signal or the third output control signal;
• supplying, by a second header circuit, the first voltage of the first voltage supply to a first voltage supply node in response to the first control signal, and supplying the second voltage of the second voltage supply to a second voltage supply node in response to a first level shifted signal, the first voltage supply node being different than the second voltage supply node, the first level shifted signal is a level shifted version of the first control signal, wherein the second header circuit is coupled to at least a first level shifter circuit;
• and
• causing the power control circuit to enter a power management mode in response to a first value of the first control signal, the power management mode having a first reduced power state and a second reduced power state, wherein causing the power control circuit to enter the power management mode comprises:
• turning off the second voltage supply.