NONVOLATILE SEMICONDUCTOR STORAGE DEVICE

摘要

PROBLEM TO BE SOLVED: To perform an efficient screening about a defective cell of a flash memory.

SOLUTION: This problem is solved by providing a nonvolatile semiconductor storage device having such features that: one terminal of a first transistor of a power supply circuit for source in the nonvolatile semiconductor storage device is connected with one terminal of a second transistor and another terminal of the first transistor is connected to the power supply; one terminal of a third transistor is connected with another terminal of the second transistor and another terminal of the third transistor is grounded; an input of the second transistor is connected with an output of an operational amplifier; and one input of the operational amplifier is a reference potential and another input is connected with a junction between the first transistor and second transistor, and this junction is connected with a source line.

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