| 摘要 |
PROBLEM TO BE SOLVED: To make compatible the high speed operation and low power consumption of a semiconductor device to operate with a low voltage. SOLUTION: In the semiconductor device having a circuit block, which has plural CMOS and has first and second operating states, and a means for controlling a threshold voltage of the CMOS into first threshold voltage state or second threshold voltage state corresponding to the respective first and second operating states, when a voltage (Vgs) between the gate and source of a P-MOS or N-MOS in the CMOS is defined as 0 V, the first threshold voltage state is set to make a current practically flow to the serially coupled source-drain passage of the CMOS and when the Vgs of a P-MOS or N-MOS in the CMOS is defined as 0 V, the second threshold voltage state is set not to make a current practically flow to the serially coupled source-drain passage of the CMOS.
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