amplifying circuit 10 a being a discharging circuit and which are disposed between a power supply terminal 21 and a grounding line 22 the power supply terminal 21 is connected to a power source vdd the first cmos circuit 8 is composed of a pmos transistor 1 and an nmos transistor 2 a source of the pmos transistor 1 is connected to the power supply terminal 21 a drain of the pmos transistor 1 and a drain of the nmos transistor 2 are connected through a common point 23 which are connected in series a source of the nmos transistor 2 is indirectly connected to a transient current amplifying circuit 10 a to a grounding line 22 the transient voltage producing circuit 12 may be composed of a single resistor 11 gates of both the pmos transistor 1 and the nmos transistor 2 are connected to a common point 23 of the gates a second cmos circuit 9 is composed of a single nmos transistor 3 a drain of the nmos transistor 3 is connected to an output terminal out a source of the nmos transistor 3 is connected to a grounding line 22 a gate of the nmos transistor is connected through a logical signal producing line node a line 25 to the common point 23 of the drain a transient current amplifying circuit 10 a is composed of a single npn transistor 6 a collector of the npn.