Patent ID: 6744683
Filing Date: 2004-06-01
Classification: G11C

Abstract:
A semiconductor device comprising:a plurality of internal circuits; and a program circuit storing prescribed information required in at least one of said plurality of internal circuits in a non-volatile fashion and performing coincidence comparison between said prescribed information and input information in a normal operation, wherein said program circuit includes: a plurality of program elements each capable of transitioning from its electrically conductive state to its electrically non-conductive state in response to an external input corresponding to said prescribed information; an internal node at which a signal indicating a result of said coincidence comparison is generated; a voltage supply switch circuit for supplying, to said internal node, one of a first voltage commonly used by at least one of said plurality of internal circuits and a second voltage different from said first voltage; and a select circuit connecting electrically at least one selected according to said input information among said plurality of program elements between said internal node and a fixed voltage, wherein said voltage supply switch circuit supplies said internal node with that one of said first and second voltages, which is smaller in potential difference from said fixed voltage than the other in said normal operation, while supplying said internal node with that one of said first and second voltages which is larger in potential difference from said fixed voltage than the one in an operation test.