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Static, low current sensing circuit for sensing the state of a fuse device

  • US 5,731,733 A
  • Filed: 09/29/1995
  • Issued: 03/24/1998
  • Est. Priority Date: 09/29/1995
  • Status: Expired due to Term
First Claim
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1. A fuse sensing circuit comprising:

  • a first circuit including a first fuse, the first circuit being coupled to receive first and second voltage supplies;

    a second circuit coupled to the first circuit in a current mirror configuration and coupled to receive the first and second voltage supplies, the second circuit including a reference resistance;

    a first output node coupled to the first circuit to indicate a state of the first fuse, a potential on the first output node being within a first range if the first fuse is un-programmed or within a second range if the first fuse is programmed; and

    a first margin test device coupled to the first circuit, the first margin test device changing the potential on the first output node when the first margin test device is turned on such that the state of the first fuse is identified as being marginal if the changed potential is not within either of the first or second ranges.

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