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Fram, fram card, and card system using the same

  • US 5,892,706 A
  • Filed: 02/04/1998
  • Issued: 04/06/1999
  • Est. Priority Date: 08/29/1994
  • Status: Expired due to Fees
First Claim
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1. A ferroelectric memory card comprising:

  • an LC filter for detecting an electromagnetic wave from a source external to the card;

    a circuit for generating a signal from the electromagnetic wave detected by said LC filter;

    a circuit for generating a power supply voltage from the electromagnetic wave detected by said LC filter;

    a power on circuit for outputting a power on reset signal upon detection of said power supply voltage being at an operational level;

    a memory cell array having a plurality of memory cells arranged in a matrix, each cell consisting of a capacitor having a ferroelectric material between electrodes thereof and a MOS transistor for transferring electrical charges, each MOS transistor within the memory cells belonging to a row being commonly connected by one word line, one of the electrodes of each capacitor within the memory cells belonging to a row being commonly connected by a plate line, one terminal of each MOS transistor of the memory cells belonging to a row being commonly connected by a bit line; and

    a reset circuit for setting each of said plate lines and said word lines at a first potential in response to said power on reset signal.

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