Semiconductor device
First Claim
1. A semiconductor device comprising:
- an oscillator which starts generating a clock pulse when an externally supplied power supply voltage becomes higher than a first voltage;
a charge pump circuit configured to execute charge pumping operation upon receiving said clock pulse; and
a voltage monitor configured to generate a power-on reset signal upon receiving an output voltage from said charge pump circuit.
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Accused Products
Abstract
A semiconductor device includes an internal power supply terminal for supplying an internal power supply voltage, an oscillator generating a clock pulse when the internal power supply voltage becomes higher than a first voltage, a charge pump circuit charge pumping upon receiving the clock pulse, a reference voltage generator using the output voltage from the charge pump circuit as a power supply, and a voltage monitor which uses the output voltage from the charge pump circuit as a power supply, has a comparator for comparing a divided voltage of the internal power supply voltage with the reference voltage, and outputs a first signal of a first logic level as the power-on reset signal when the internal power supply voltage is higher than a second voltage. With this arrangement, a power-on reset circuit with little variation in power-on monitoring level can be provided.
26 Citations
28 Claims
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1. A semiconductor device comprising:
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an oscillator which starts generating a clock pulse when an externally supplied power supply voltage becomes higher than a first voltage;
a charge pump circuit configured to execute charge pumping operation upon receiving said clock pulse; and
a voltage monitor configured to generate a power-on reset signal upon receiving an output voltage from said charge pump circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A semiconductor device comprising:
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an internal power supply terminal configured to supply an externally supplied power supply voltage as an internal power supply voltage;
a reference voltage generator configured to generate a reference voltage from said internal power supply voltage;
a power-on reset circuit; and
a peripheral circuit other than said power-on reset circuit, wherein after said reference voltage is generated, power-on reset operation of resetting said peripheral circuit other than said power-on reset circuit is executed.
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19. A semiconductor device comprising:
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a voltage down converter configured to generate a dropped voltage as an internal power supply voltage from an externally supplied power supply voltage;
a reference voltage generator configured to generate a reference voltage from said power supply voltage;
a power-on reset circuit; and
a peripheral circuit other than said power-on reset circuit, wherein after said reference voltage is generated, power-on reset operation of resetting said peripheral circuit other than said power-on reset circuit is executed.
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20. A semiconductor memory device comprising:
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a memory cell array in which a plurality of memory cells are arranged;
a register configured to store data read out from said plurality of memory cells;
a reference voltage circuit configured to generate a reference voltage; and
a charge pump circuit configured to charge-pump a power supply voltage for said reference voltage circuit during a period of a read-out operation when said data are read out from said plurality of memory cells. - View Dependent Claims (21, 22, 23, 24, 25, 26, 28)
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27. A semiconductor memory device comprising:
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a memory cell array in which a plurality of memory cells are arranged;
a read-out circuit configured to read out data from the plurality of memory cells;
a reference voltage circuit configured to generate a reference voltage; and
a charge pump circuit, in a read-out operation in which a power supply voltage is not more than a predetermined potential, configured to supply a charge-pumped voltage higher than said power supply voltage not more than said predetermined potential as a power supply voltage for said reference voltage circuit.
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Specification