Noncontacting IC card supplied with power from an outside source

Details Noncontacting IC card supplied with power from an outside source Noncontacting IC card supplied with power from an outside source

1989-02-14

1990-10-09

Moffitt, James W.

Static information storage and retrieval

Powering

Data preservation

G11C 700

Patent

active

049624857

ABSTRACT:
An IC card such as cash card is disclosed. The IC card has a RAM, a control circuit for controlling access to the RAM, and a power supply circuit receiving outside energy and supplying power to the RAM and the control circuit. A first voltage detector produces a starting output when supply voltage of the power exceeds a predetermined first reference voltage. A second voltage detector produces a control signal when the supply voltage exceeds a predetermined second reference voltage, which is higher than the first reference voltage. An AND gate is provided to produce a RAM control signal for operating the RAM when the starting signal and the control signal are applied thereto.

REFERENCES:
patent: 4547629 (1985-10-01), Corless
patent: 4777626 (1988-10-01), Matsushita et al.
patent: 4818891 (1989-04-01), Drinkwater
patent: 4855994 (1989-08-01), Takeuchi et al.

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