Fuse and antifuse reprogrammable link for integrated circuits
First Claim
Patent Images
1. A reprogrammable electrical circuit comprising:
- a first terminal;
a second terminal;
a link, connected between said first terminal and said second terminal, wherein said link includes at least one fuse and at least one antifuse, said fuse and said antifuse being connected together in series, whereby the circuit is reprogrammable so as to alternatively open and close an electrically conductive path between said first terminal and said second terminal;
a first fuse and a first antifuse connected in series to form a first series sublink, said first series sublink connected on one end to said first terminal and on the other end to said second terminal;
a second fuse, connected in parallel with said first series sublink, wherein said link comprises said first sublink and said second fuse, whereby allowing reprogramming of said semiconductor device more than once; and
a second antifuse and a third fuse connected in series to form a second series sublink, said second series sublink connected in parallel with said first fuse, whereby allowing programming of said semiconductor device more than once.
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Accused Products
Abstract
A fuse and antifuse link structure, which when used with a memory integrated circuit device such as a gate array or programmable mad-only memory (PROM), allows the memory circuit to be reprogrammed. The fuse and antifuse link is comprised of a fuse 12 and an antifuse 16, connected in series, parallel, or a combination thereof. Either element of the link can be programmed initially, and the other can be programmed in a second step, to reverse the first programming. Several links can be used in one circuit to provide multiple reprogramming capability.
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Citations
23 Claims
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1. A reprogrammable electrical circuit comprising:
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a first terminal; a second terminal; a link, connected between said first terminal and said second terminal, wherein said link includes at least one fuse and at least one antifuse, said fuse and said antifuse being connected together in series, whereby the circuit is reprogrammable so as to alternatively open and close an electrically conductive path between said first terminal and said second terminal; a first fuse and a first antifuse connected in series to form a first series sublink, said first series sublink connected on one end to said first terminal and on the other end to said second terminal; a second fuse, connected in parallel with said first series sublink, wherein said link comprises said first sublink and said second fuse, whereby allowing reprogramming of said semiconductor device more than once; and a second antifuse and a third fuse connected in series to form a second series sublink, said second series sublink connected in parallel with said first fuse, whereby allowing programming of said semiconductor device more than once.
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2. A reprogrammable electrical circuit comprising:
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a first terminal; a second terminal; a link, connected between said first terminal and said second terminal, wherein said link includes at least one fuse and at least one antifuse, said fuse and said antifuse being connected together in series, whereby the circuit is reprogrammable so as to alternatively open and close an electrically conductive .path between said first terminal and said second terminal; a first antifuse and a first fuse connected in series between said first terminal and said second terminal; a second fuse and a second antifuse connected in series to form a series sublink, said series sublink connected in parallel with said first fuse, wherein said link comprises said first antifuse, said first fuse and said series sublink, whereby allowing reprogramming of said semiconductor device more than once.
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3. An array of sublinks for an integrated circuit, said array comprising:
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a first terminal; a second terminal; at least two sublinks, wherein said sublinks consist of;
one fuse and one antifuse connected in series;wherein said sublinks are connected in parallel and whereby the circuit is reprogrammable so as to selectively define an electrically conductive path between said input terminal and said output terminal. - View Dependent Claims (4, 5)
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6. A method of altering a connection within a semiconductor device in order to allow reprogrammability, comprising the steps of:
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a) fabricating a semiconductor device with a first fuse and first antifuse connected in series to form a first series sublink, a second fuse and second antifuse connected in series to form a second series sublink, where said second antifuse is a higher voltage antifuse and blows at a higher voltage than said first antifuse;
where said first series sublink and said second series sublink are connected in parallel between said first terminal and said second terminal to allow reprogramming said semiconductor device more than once, and wherein said first series sublink connected between a first terminal and a second terminal;b) applying a voltage across said first antifuse, blowing said first antifuse and programming said first antifuse closed;
thenc) applying a current through said first fuse, thereby blowing said first fuse and programming said first fuse open;
thend) applying a voltage across said second antifuse, thereby blowing said second antifuse and programming said second antifuse closed;
thene) applying a current through said second fuse, thereby blowing said second fuse and programming said second fuse open. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A method of altering a connection within a semiconductor device in order to allow reprogrammability, comprising the steps of:
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a) fabricating a semiconductor device with a first fuse and first antifuse connected in parallel to form a first parallel sublink, a second fuse and a second antifuse connected in parallel to form a second parallel sublink, where said second fuse is a higher current fuse and blows at a higher current than said first fuse, where said first parallel sublink and said second parallel sublinks are connected in series between said first terminal and said second terminal to allow reprogramming said semiconductor device more than once; b) applying a current through said first fuse, thereby blowing said first fuse and programming said first fuse open, then; c) applying a voltage across said first antifuse, blowing said first antifuse and programming said first antifuse closed, then; d) applying a current through said second fuse, thereby blowing said second fuse and programming said second fuse open;
thene) applying a voltage across said second antifuse, thereby blowing said second antifuse and programming said second antifuse closed. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of altering a connection within a semiconductor device in order to allow reprogrammability, comprising the steps of;
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a) fabricating a semiconductor device with a first fuse and first antifuse connected in series to form a first series Sublink, wherein said first series sublink is connected in parallel with a second fuse between a first terminal and a second terminal, further comprising a second antifuse and a third fuse connected in series to form a second series sublink, said second series sublink; b) applying a current through said second fuse by applying an electrical signal across said first terminal and said second terminal, thereby blowing said second fuse and programming said second fuse open;
thenc) applying a voltage across said first antifuse by applying said voltage across said first terminal and said second terminal, thereby blowing said first antifuse and programming said first antifuse closed;
thend) applying a current through said first fuse by applying an electrical signal across said first terminal and said second terminal, thereby blowing said first fuse and programming said first fuse open;
thene) applying a voltage to said second antifuse by applying said voltage across said first terminal and said second terminal, thereby blowing said second antifuse and programming said second antifuse closed;
then,f) applying a current to said third fuse by applying an electrical signal across said first terminal and said second terminal, thereby blowing said third fuse and programming said third fuse open.
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19. A method of altering a connection within a semiconductor device in order to allow reprogrammability, comprising the steps of:
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a) fabricating a semiconductor device with a first fuse and first antifuse connected in series between a first terminal and a second terminal, a second fuse and second antifuse connected in series to form a series sublink, where said series sublink connected in parallel with said first fuse; applying a voltage across said first antifuse by applying said voltage across said first terminal and said second terminal, thereby blowing said first antifuse and programming said first antifuse closed;
thenc) applying a current through said first fuse by applying an electrical signal across said first terminal and said second terminal, thereby blowing said first fuse and programming said first fuse open;
thend) applying a voltage across said first terminal and said second terminal, thereby blowing said second antifuse and programming said second antifuse closed;
thene) applying a current through said first terminal and said second terminal, thereby blowing said second fuse and programming said second fuse open.
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20. A reprogrammable electrical circuit comprising:
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a first terminal; a second terminal; a link, connected between said first terminal and said second terminal, wherein said link includes at least one fuse and at least one antifuse, said fuse and said antifuse being connected together in parallel, whereby the circuit is reprogrammable so as to alternatively open and close an electrically conductive path between said first terminal and said second terminal a first fuse and a first antifuse connected in series to form a first series sublink, said first series sublink connected on one end to said first terminal and on the other end to said second terminal; a second fuse, connected in parallel with said first series sublink, wherein said link comprises said first sublink and said second fuse, whereby allowing reprogramming of said semiconductor device more than once; and a second antifuse and a third fuse connected in series to form a second series sublink, said series sublink connected in parallel with said first fuse, whereby allowing programming of said semiconductor device more than once.
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21. A reprogrammable electrical circuit comprising:
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a first terminal; a second terminal; a link, connected between said first terminal and said second terminal, wherein said link includes at least one fuse and at least one antifuse, said fuse and said antifuse being connected together in parallel, whereby the circuit is reprogrammable so as to alteratively open and close an electrically conductive path between said first terminal and said second terminal;
a first antifuse and a first fuse connected in series between said first terminal and said second terminal; anda second fuse and a second antifuse connected in series to form a series sublink, said series sublink connected in parallel with said first fuse, wherein said link comprises said first antifuse, said first fuse and said series sublink, whereby allowing reprogramming of said semiconductor device more than once.
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22. An array of sublinks for an integrated circuit, said array comprising:
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a first terminal; a second terminal; at least two sublinks, wherein said sublinks consist of one fuse and one antifuse connected in parallel; wherein said sublinks are connected in series and whereby the circuit is reprogrammable so as to selectively define an electrically conductive path between said input terminal and said output terminal. - View Dependent Claims (23)
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Specification