Memory card with control and voltage boosting circuits and electronic appliance using the same
First Claim
Patent Images
1. A memory card, comprising:
- a RAM, a voltage converter for boosting a voltage of a battery and outputting a boosted voltage, and a switching circuit for receiving said boosted voltage and an externally supplied voltage and supplying one of said boosted voltage and said externally supplied voltage to said RAM as a driving voltage therefor;
said voltage converter comprising a clock signal generator circuit for generating a clock signal, a voltage converter circuit for receiving said clock signal, for said boosting of said voltage of said battery by using said clock signal as a control signal and for outputting said boosted voltage; and
a control circuit for detecting said boosted voltage, comparing said boosted voltage with a predetermined standard value and controlling said clock signal generator circuit on a basis of said comparing.
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Accused Products
Abstract
A memory card mounted with a storage device and an electronic appliance using such a memory device. The memory card has an RAM (36), a battery (38), a voltage converter (40) for boosting a voltage of the battery and for outputting the boosted voltage, and a switching circuit (42) for receiving an output voltage of the voltage converter and an externally supplied voltage and for supplying one of the received voltages to the RAM as a driving voltage therefor, so that a voltage higher than the battery voltage is supplied to the RAM at the time of backup to thereby reduce soft errors.
51 Citations
14 Claims
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1. A memory card, comprising:
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a RAM, a voltage converter for boosting a voltage of a battery and outputting a boosted voltage, and a switching circuit for receiving said boosted voltage and an externally supplied voltage and supplying one of said boosted voltage and said externally supplied voltage to said RAM as a driving voltage therefor; said voltage converter comprising a clock signal generator circuit for generating a clock signal, a voltage converter circuit for receiving said clock signal, for said boosting of said voltage of said battery by using said clock signal as a control signal and for outputting said boosted voltage; and
a control circuit for detecting said boosted voltage, comparing said boosted voltage with a predetermined standard value and controlling said clock signal generator circuit on a basis of said comparing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A memory card, comprising:
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a RAM, a voltage converter for boosting a voltage of a battery and outputting a boosted voltage, and a switching circuit for receiving said boosted voltage and an externally supplied voltage and supplying one of said boosted voltage and said externally supplied voltage to said RAM as a driving voltage therefor; said voltage converter comprising a clock signal generator circuit for generating a clock signal, a voltage converter circuit for receiving said clock signal, for said boosting of said voltage of said battery by using said clock signal as a control signal and for outputting said boosted voltage, said clock signal generator circuit comprising a voltage stabilizer circuit for lowering said voltage of said battery, and an oscillator circuit driven by said voltage stabilizer circuit.
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12. An electronic appliance in which a memory card is mounted and from which a driving voltage is supplied to said memory card, said memory card comprising:
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a RAM, a battery, a voltage converter for boosting a voltage of said battery and outputting a boosted voltage, and a switching circuit for receiving said boosted voltage and an externally supplied voltage and supplying one of said boosted voltage and said externally supplied voltage to said RAM as a driving voltage therefor; said voltage converter comprising a clock signal generator circuit for generating a clock signal, a voltage converter circuit for said boosting of said voltage of said battery by using said clock signal as a control signal, and a control circuit for detecting said boosted voltage, comparing it with a predetermined value and then controlling said clock signal generator circuit on a basis of a result of said comparing. - View Dependent Claims (13)
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14. An electronic appliance in which a memory card is mounted and from which a driving voltage is supplied to said memory card, said memory card comprising:
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a RAM, a battery, a voltage converter for boosting a voltage of said battery and outputting a boosted voltage, and a switching circuit for receiving said boosted voltage and a voltage from the electronic appliance and outputting one of said boosted voltage and said voltage of said electronic appliance to said RAM as a driving voltage therefor; said voltage converter comprising a clock signal generator circuit for generating a clock signal, a voltage converting circuit for said boosting of said voltage of said battery by using said clock signal as a control signal; and said clock signal generator circuit comprising a voltage stabilizer circuit for lowering said voltage of said battery, and an oscillator circuit driven by said voltage stabilizer circuit.
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Specification