EP0391603A2
Expired / Lapsed
EP
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Information card
Assignee: Mitsubishi Electric Corp
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Filing: 1990-03-29
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Granted: —
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Expires: 2010-03-29
Abstract
Abstract An information card includes a plurality of volatile memory circuits and backs up data stored in the volatile memory circuits by an internal battery when an external power supply is OFF and the information card further includes a capacitor provided between an active enable input line for enabling an address decoder which selects the plurality of volatile memory circuits and a low voltage common power supply so as to reduce high frequency impedance of the active enable input line.
Inventors
- 👤 Takayuki C/O Mitsubishi Denki Shinohara
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 01:42
CPC Classifications
G; G11; G11C; G11C8/00; G11C8/10; G06; G06K; G06K19/00; G06K19/06; G06K19/067; G06K19/07; G11C5/00; G11C5/14; G11C5/141; G11C8/12; G11C8/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
78 words
An information card comprising a plurality of volatile memory circuits and backing up data stored in the volatile memory circuits by an internal battery when an external power supply is OFF, said information card further comprising a capacitor provided between an active enable input line for enabling an address decoder which selects said plurality of volatile memory circuits and a low voltage common power supply so as to reduce high frequency impedance of said active enable input line.
Claim 2
Dependent Claim
78 words
An information card comprising a plurality of volatile memory circuits and backing up data stored in the volatile memory circuits by an internal battery when an external power supply is OFF, said information card further comprising a capacitor provided between an active enable input line for enabling an address decoder which selects said plurality of volatile memory circuits and a low voltage common power supply so as to reduce high frequency impedance of said active enable input line.
Claim 3
Dependent Claim
39 words
An information card in accordance with claim 1, further comprising a resistor provided between said active enable input line and said capacitor so as to discharge an electric charge in the capacitor when the external power supply is OFF.
Claim 4
Dependent Claim
59 words
A volatile memory system comprising: a volatile memory array; and an address decoder for addressing the array, which decoder has an active enable input line; characterised in that: said active enable input line is arranged to exhibit a low high-frequency impedance whereby said system is afforded protection in the event of an electrostatic discharge being applied to said line.
Claim 5
Dependent Claim
59 words
A volatile memory system comprising: a volatile memory array; and an address decoder for addressing the array, which decoder has an active enable input line; characterised in that: said active enable input line is arranged to exhibit a low high-frequency impedance whereby said system is afforded protection in the event of an electrostatic discharge being applied to said line.
References Cited (Backward Citations)
No citation records indexed.
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