An image shooting unit 21 generates an image signal DVb having an image shooting frame rate. The integrated circuit memory may include a buffer memory with a sufficient capacity to store a plurality of words, the output of which is coupled to the input of the FLASH memory. The transducer housing may also carry such components as a battery, a wireless receiver, and a controller. The bit lines are arranged along at least two different parallel planes having different heights relative to the semiconductor substrate. Since the read address and the held write address are compared by a plurality of address comparators, the scale of circuits in the address comparison part can be reduced. The compounds are useful in vitro or in vivo for preventing or treating coagulation disorders.