JPH05307897

PURPOSE:To maintain the high speed of operation regardless of the presence of defect saving by using a MOBFET and switching the transfer path of an address signal with a redundant signal and outputting a defect signal with an auxiliary circuit. CONSTITUTION:The redundant signal is supplied to the gate of a P channel type MOSFET QP through an N channel type MOSFET QN and an inverter circuit IV. Then, when the redundant signal is a high level, both transistors QN and QP are turned on and when a low level, turned off. In such a case, in the state of cutting a fuse, the redundant signal becomes the low level and the transistor QP1 is turned off and an inout signal ELC1 is not transferred to an output terminal OUT1. At this time, the transistor QP2 is turned on and the input signal ELC2 is outputted to the output terminal OUT2. Then the defect circuit having the redundant signal is switched to the corresponding auxiliary circuit and the high speed of operation is maintained since the number of logic stage is made equal regardless of the presence of the defect saving.