Patent ID: 6147909
Filing Date: 2000-11-14
Classification: G11C

Abstract:
A nonvolatile semiconductor memory device (an electrically erasable and programmable read only memory, EEPROM, comprising:invertors respectively connected with word lines,a P potential supply circuit for supplying a potential to sources of P channel transistors in said invertors,a N potential supply circuit for supplying a potential to sources of N channel transistors in said invertors,a read/write decision circuit for deciding whether said EEPROM operates in a write or read mode, andan erase decision circuit for deciding whether said EEPROM operates in an erase mode or not,wherein said P potential supply circuit outputs one of a first positive potential, a second positive potential and a ground potential; and said N potential supply circuit outputs one of a third positive potential, a ground potential and a negative potential in accordance with output signals of said read/write decision circuit and said erase decision circuit.