| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a standby circuit capable of speedily change to a low power consumption state, when it is changed to the low power consumption mode and for decreasing the layout area required. <P>SOLUTION: When a Q1 goes to OFF operation when Cnt1 signal is at H level indicating a low power consumption mode, there is no bias supply to a drive circuit 3 and the output goes to H level. This turns off Q11, to shut off a power supply to an electronic circuit 5. In this case, sufficient electric charge is accumulated for maintaining a conductive state between a gate and source of Q11, is, but a Q12 goes to ON state by a Cnt2 signal, an inverted Cnt1 signal, forming a discharge path of the electric charge accumulated between the gate and source of the Q11, the accumulated electric charge between the gate and source of the Q11 is decreased to the threshold or lower, which can maintain a conduction state faster than the natural discharge. <P>COPYRIGHT: (C)2004,JPO |
