Memory card having improved data protection

Details Memory card having improved data protection Memory card having improved data protection

1987-10-22

1989-03-07

Paschall, M. H.

Registers

Records

235380, 361 91, G06K 1900, H02H 320

Patent

active

048108642

ABSTRACT:
A memory card for storing information having a shape similar to that of a credit card. The memory card includes a capacitor connected across power terminals of a RAM and a resistor connected between one power terminal of the RAM and an external terminal. A switch is connected in parallel with the resistor for short-circuiting the resistor. The switch is controlled in accordance with a signal from an external device. When the RAM is accessed by the external device, the switch is closed so that the impedance of the power supply line is decreased.

REFERENCES:
patent: 4004133 (1977-01-01), Hannan et al.
patent: 4272758 (1981-06-01), Giraud
patent: 4506148 (1985-03-01), Berthold et al.
patent: 4521679 (1985-06-01), Anderson
patent: 4645914 (1987-02-01), Hiraishi
patent: 4692601 (1987-09-01), Nakano

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