this invention provides ways to intercept abnormal power signals to prevent damaging the memory in a semiconductor . to achieve this , the semiconductor memory comprises a first control signal line controlling a selection from row addresses , a second control signal line controlling a selection from column addresses , a first voltage control means cutting off the first control signal line in case that predetermined number of control signals are abnormal , and a second voltage control means cutting off the second control signal line in case that predetermined number of control signals are abnormal .