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US 7,734,433 B2Granted
Semiconductor integrated circuit
AssigneeFujitsu Limited
InventorAkihiko Konmoto
Life of this patent
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Abstract
A semiconductor integrated circuit includes a first power source having a power supply voltage that operates the semiconductor integrated circuit, a voltage comparator that compares the power supply voltage with a reference voltage, and a comparison result recording unit that records a comparison result of the voltage comparator, wherein the comparison result recording unit records a length of a period based on a clock signal for which the power supply voltage exceeds the reference voltage.
Claims8
A semiconductor integrated circuit comprising:
- a first power source that has a power supply voltage for operating the semiconductor integrated circuit;
- a voltage comparator that compares the power supply voltage with a reference voltage;
- a clock controller that expands the width of a pulse of the clock signal without changing the frequency of the clock signal and supplies an expanded clock signal;
- and
- a comparison result recording unit for recording a comparison result of the voltage comparator, wherein the comparison result recording unit records a length of a period based on the expanded clock signal for which the power supply voltage exceeds the reference voltage.
2 more elements
A semiconductor integrated circuit comprising:
- a first power source that has a power supply voltage for operating the semiconductor integrated circuit;
- a voltage comparator that compares the power supply voltage with a reference voltage;
- a clock controller that expands the width of a pulse of the clock signal without changing the frequency of the clock signal and supplies an expanded clock signal;
- and
- a comparison result recording unit for recording a comparison result of the voltage comparator, wherein the comparison result recording unit records a length of a period for which the power supply voltage exceeds the reference voltage while the expanded clock signal inputting to the comparison result recording unit is on.
2 more elements
Dependencies are inferred from the claim text.