Patent ID: 7095269
Filing Date: 2006-08-22
Classification: G05F

Abstract:
1. A voltage generator comprising: a voltage generator circuit that raises a level of an output voltage when a voltage level detection signal is a first logical level and that lowers the level of the output voltage when the voltage level detection signal is a second logical level; a first voltage level detection circuit generating a first detection signal in accordance with a first detection level, wherein the first voltage level detection circuit includes a second voltage level detection circuit generating a second detection signal in accordance with a second detection level that is lower than the first detection level; and a selection circuit connected to the first and second voltage level detection circuits, wherein the selection circuit outputs a signal equivalent to the first detection signal as the voltage level detection signal when a power supply voltage level is equal to or higher than a first voltage level or when the power supply voltage level is equal to or lower than a second voltage level that is lower than the first voltage level, and wherein the selection circuit outputs a signal equivalent to the second detection signal as the voltage level detection signal when the power supply voltage level is lower than the first voltage level and higher than the second voltage level.