NONVOLATILE SEMICONDUCTOR STORAGE DEVICE

摘要

Provided is a nonvolatile semiconductor storage device that can maintain fast read operation and determination accuracy without increasing circuit size even when determination current differs depending on operations. A first transistor and a second transistor are connected to a data node and a reference node, respectively. During a data state determination operation, when applying a voltage to the data node and the reference node, the first and second transistors operate as precharge transistors in a first operation mode and operate as mirror transistors in a second operation mode, wherein the first and second operation modes are switched.