| 摘要 |
PURPOSE:To obtain large driving capability with small chip area without limiting the design of a power source by inputting the output of a logical circuit part which is connected to the 1st power source to a level shifting circuit and a driving circuit part. CONSTITUTION:The logical circuit part is driven by a power source 14 and the driving circuit part 6 which requires a high voltage and has large current consumption is driven by a power source 15. The level shifting circuit part 10 is driven by the serial circuit of the power sources 14 and 15 between VDD and VEE, so the maximum value of driving input voltage viewed from the driving circuit part 6 is the sum of the output voltage of the power source 14 and the output voltage of the power source 15. The current consumption of the level shifting circuit 10 is not large in general and there is not any special problem in the design of the power sources 14 and 15. Further, the power sources 14 and 15 are independent of the ground potential, so the grounding line of the system is utilized effectively and the designing of the power sources is easy. |
