IC card

Details IC card IC card

1995-08-23

1996-10-22

Nguyen, Tan T.

Static information storage and retrieval

Powering

Data preservation

365228, 235492, G11C 514

Patent

active

055684416

ABSTRACT:
An IC card according to the present invention includes a lithium cell that, when the IC card is disconnected from a system, supplies power required for retention of data in a volatile static random access memory (SRAM); a first capacitor connected in parallel with the lithium cell in order to accumulate charge, a second capacitor connected in parallel with the lithium cell in order to accumulate charge, and a switch for connecting the first capacitor and the second capacitor in series with each other during replacement of the lithium cell. The series circuit of the first and second capacitors serves as a backup power source during replacement of the lithium cell. As a result, the time available for cell replacement without loss of stored data is increased.

REFERENCES:
patent: 5212664 (1993-05-01), Shinohara
patent: 5343436 (1994-08-01), Suzuki

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