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Data card circuits

  • US 4,841,133 A
  • Filed: 03/30/1988
  • Issued: 06/20/1989
  • Est. Priority Date: 06/30/1987
  • Status: Expired due to Term
First Claim
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1. A data card of the type comprising an integrated circuit on a semiconductor chip embedded in a plastic card, the circuit including a non-volatile memory having a transport code preprogrmamed therein, control circuitry for controlling the circuit, a comparator having a first input coupled to an input node of the circuit for receiving an externally-applied code and a second input coupled to said memory for comparing said externally-applied and transport codes, and a first irreversible switch coupled to an output of the comparator such that said first irreversible switch is actuated if the externally-applied and transport codes match.

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