Patent ID: 8653865

Claim:
A voltage change detection device comprising: a reference potential generator adapted to generate a reference potential based on a power supply potential; a comparison potential generator adapted to generate a comparison potential based on the power supply potential; and a detection signal generator that generates adapted to generate a detection signal indicating that the power supply potential has changed to cross a predetermined detection potential according to a comparison between the reference potential and the comparison potential, wherein the reference potential generator includes one of a first resistor and a first constant current source connected to a ground potential and a first field effect transistor having a drain connected to the power supply potential, a source connected to the one of the first resistor and the first constant current source at a first node, and a gate connected to a fixed voltage, wherein the comparison potential generator includes one of a second resistor and a second constant current source connected to the ground potential and a second field effect transistor having a drain and a gate connected to the power supply potential and a source connected to the one of the second resistor and the second constant current source at a second node, and wherein the detection signal generator generates the detection signal using a voltage at the first node as the reference potential and using a voltage at the second node as the comparison potential, wherein the fixed voltage is the ground potential.