31 and 32 are used to shape the waveform of a signal output to the node n10 fig2 is a circuit diagram showing one example of a configuration of the one shot pulse generator circuit 10 shown in fig1 the one shot pulse generator circuit 10 comprises an odd number of inverters 11 1 through 11 m and a two input nand gate 12 the odd number of inverters 11 1 through 11 m are electrically series connected to an input terminal in and one of input terminals of the two input nand gate 12 the other input terminal of the two input nand gate 12 is electrically connected to the input terminal in an output of the two input nand gate 12 is electrically connected to an output terminal out fig3 is a waveform chart for describing the operation of the one shot pulse generator circuit 10 shown in fig2 when a gt signal input to the input terminal in is of an l level the gt signal is first inverted in turn by each of the odd number of inverters 11 1 through 11 m accordingly the one input terminal of the two input nand gate 12 is supplied with an h level further the other input terminal of the two input nand gate 12 is supplied with the l level gt signal therefore a potential of the h level is output to the output terminal out a description will now be made of a case where the gt signal changes from the l level to the h level the one and other terminals of.