ACTIVATOR OF SUBSTRATE POTENTIAL GENERATION CIRCUIT

摘要

PURPOSE:To provide a title device which prevents the malfunction of semiconductor devices by giving proper substrate potentials even when this device built in a semiconductor device has special control clocks such as for a multiport DRAM. CONSTITUTION:A semiconductor device with a built in substrate potential generation circuit 5 comprises a control clock frequency discriminating circuit 7 which judges whether or not the repetition frequency of the control clock SC of a semiconductor device is over a predetermined value, so as to activate the substrate potential generation circuit 5 when the repetition frequency of the control clock SC is over the predetermined value.