A hypodermic syringe provides a simple mechanism for manually retracting its needle into the syringe after injection has been completed. The semiconductor device is a system-in-package for power supply applications in which a high-side switch, a low-side switch, and two drivers are included in a single package. A voltage level of the bitline precharge signal reaches the VDD level for a predetermined time from an enabled starting point of the bitline precharge enable signal, and then the voltage level of the bitline precharge signal reaches the VPP level after the predetermined time.