Patent ID: 7215155

Claim:
A Multi-Threshold Complementary Metal Oxide Semiconductor (MTCMOS) device comprising: a high threshold voltage current control switch that is responsive to a first control signal; a low threshold voltage logic circuit; a flip flop that is configured to store data for the low threshold voltage logic circuit and that is responsive to a second control signal; and a control circuit that is configured to change a logic state of the second control signal from a first logic state to a second logic state and, after a predetermined delay time tD 1 , to change a logic state of the first control signal from the second logic state to the first logic state such that the first and second control signals are both at the second logic state for the predetermined delay time tD 1 when the MTCMOS device is converted from an active mode to a sleep mode, and is further configured to change the logic state of the first control signal from the first logic state to the second logic state and, after a predetermined delay time tD 2 that is different from tD 1 , to change the logic state of the second control signal from the second logic state to the first logic state such that the first and second control signals are both at the second logic state for the predetermined delay time tD 2 when the MTCMOS device is converted from the sleep mode to the active mode.