Patent ID: 6498760
Filing Date: 2002-12-24
Classification: G11C

Abstract:
A semiconductor device driven by an external power supply potential, comprising:a first reference potential generating circuit of which output potential is adjustable, for outputting a first internal reference potential which is lower than said external power supply potential; a first power supply circuit for maintaining a first power supply node at said first internal reference potential in a normal operation mode, and maintaining said first power supply node at an external reference potential in a test mode; a second power supply circuit for maintaining a second power supply node at a boosted potential higher than said first internal reference potential by a predetermined first voltage in said normal operation mode, and supplying said external power supply potential to said second power supply node in said test mode; a level shifting circuit for outputting a potential obtained by level-shifting the potential of said first power supply node by a predetermined second voltage to said external power supply potential side; a third power supply circuit for maintaining a third power supply node at an output potential of said level shifting circuit; and an internal circuit for receiving a drive power from said first to third power supply circuits via said first to third power supply nodes and performing a predetermined operation.