| 摘要 |
<p>PURPOSE:To make the IC of low voltage specification and the IC of high voltage specification capable of being operated simultaneously by single low voltage power supply, and in addition, to obtain the integrated circuit in which the lengthening of the life of a battery by the low consumption of a current and the reduction of cost and the miniaturization of a case by the reduction of the number of parts are attained. CONSTITUTION:A booster circuit 44 to generate voltage higher than supply voltage by boosting the supply voltage by using a condenser and a power supply switching circuit 40 to switch either the output voltage of the booster circuit or the supply voltage according to the input of a voltage control signal are provided. The voltage higher than the supply voltage is generated by the booster circuit 44, but it is not normally outputted, and the output voltage of the booster circuit and the supply voltage are switched and outputted by the power supply switching circuit 40 as occasion demands.</p> |
