Patent US2992699A successfully refreshed from Google Patents.
EP0437129A2
Expired / Lapsed
EP
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Card type semiconductor device
Assignee: Fujitsu VLSI Ltd
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Filing: 1990-12-13
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Granted: —
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Expires: 2010-12-13
Abstract
Abstract A card type semiconductor device includes: a terminal for receiving an external power source voltage (from system 7), a semiconductor device (5) operatively connected to said terminal, a primary battery (1) for supplying a first power source voltage, and a secondary battery (2) for supplying a second power source voltage. The card type semiconductor device further includes a first switching means (31) for supplying the first power source voltage from the primary battery to the semiconductor device, when the external power source voltage is not supplied, a second switching means for supplying the second power source voltage from the secondary battery to the semiconductor device, when the first power source voltage is not supplied, and means for charging the secondary battery by the first power source voltage supplied from the primary battery. <IMAGE>
Inventors
- 👤 Ryuji Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 03:03
CPC Classifications
G; G11; G11C; G11C5/00; G11C5/14; G11C5/143; G11C5/141; H; H02; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
117 words
A card type semiconductor device comprising: a terminal for receiving an external power source voltage; a semiconductor device operatively connected to said terminal; a primary battery for supplying a first power source voltage; a secondary battery for supplying a second power source voltage; a first switching means for supplying said first power source voltage from said primary battery to said semiconductor device, when the external power source voltage is not supplied; a second switching means for supplying said second power source voltage from said secondary battery to said semiconductor device, when said first power source voltage is not supplied; and means for charging said secondary battery by said first power source voltage supplied from said primary battery.
Claim 2
Dependent Claim
39 words
The device according to claim 1, wherein said first switching means, said second switching means and said means for charging said secondary battery by said first power source voltage supplied from said primary battery, include one or more diodes.
Claim 3
Dependent Claim
46 words
The device according to claim 1, wherein a third switching means is provided between said terminal and said semiconductor device, said third switching means being, when an exterior power supply voltage is not applied to said terminal, able to disconnect said terminal from said semiconductor device.
Claim 4
Dependent Claim
31 words
The device according to claim 3, wherein a voltage detecting circuit for monitoring said external power source voltage is provided for controlling said third switching means by the detected output thereof.
Claim 5
Dependent Claim
45 words
The device according to claim 1, wherein a first power source voltage of said primary battery is lower than the voltage of said external power source and a second power source voltage of said secondary battery is also lower than said external power source voltage.
Claim 6
Dependent Claim
25 words
The device according to claim 1, wherein there is provided a means for charging said secondary battery by means of said external power source voltage.
Claim 7
Dependent Claim
12 words
The device according to claim 1, wherein said primary battery is detachable.
Claim 8
Dependent Claim
15 words
The device according to claim 1, wherein said semiconductor device is a volatile memory device.
Claim 9
Dependent Claim
14 words
The device according to claim 1, wherein said semiconductor device is a microprocessor chip.
Claim 10
Dependent Claim
157 words
An electronic system comprising: a card type semiconductor device including: a terminal for receiving an external power source voltage; a semiconductor device operatively connected to said terminal; a primary battery for supplying a first power source voltage; a secondary battery for supplying a second power source voltage; a first switching means for supplying said first power source voltage from said primary battery to said semiconductor device, when the external power source voltage is not supplied thereto; a second switching means for supplying the second power source voltage from said secondary battery to said semiconductor device, when the first power source voltage is not supplied thereto; means for charging said secondary battery by said first power source voltage supplied from said primary battery; and an apparatus to which said card type semiconductor device is connected, wherein said apparatus for connecting said card type semiconductor device, supplies the external power source voltage intermittently to said card type semiconductor device.
Claim 11
Dependent Claim
40 words
The system according to claim 10, wherein said semiconductor device comprises a semiconductor memory and the apparatus to which said card type semiconductor device is connected, and supplies the power source voltage selectively when the system accesses the semiconductor memory.
Claim 12
Dependent Claim
103 words
A card type semiconductor device comprising, a semiconductor device, a means for receiving an external power source voltage, a battery, a rechargeable battery, a means for supplying a voltage of said battery to said semiconductor device in place of said external power source voltage, when said external power source voltage is not supplied to said semiconductor device, a means for supplying a voltage of a power source from said rechargeable battery to said semiconductor device, and a means for applying a charging voltage from said battery to said rechargeable battery, when the voltage of said rechargeable battery is lower than a predetermined voltage.
References Cited (Backward Citations)
No citation records indexed.
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