Low current redundancy anti-fuse method and apparatus
First Claim
1. An integrated circuit comprising:
- an enabling type programmable circuit providing an enable signal having a programmed state and unprogrammed state; and
at least one second type programmable circuit providing a programmed signal having a first state and a second state and prevented from being in a selected one of the first or second states in response to the enable signal being in the unprogrammed state, the at least one programmable circuit including a first anti-fuse and a second anti-fuse, wherein the programmed signal is in the first state in response to the enable signal being in the programmed state and the first anti-fuse being programmed and the programmed signal is in the second state in response to the enable signal being in the programmed state and the second anti-fuse being programmed, further wherein the first anti-fuse is programmed when the second anti-fuse is unprogrammed and the first anti-fuse is unprogrammed when the second anti-fuse is programmed.
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Accused Products
Abstract
A programmable circuit includes a first node and provides a programmed signal based on the state of the first node. A first anti-fuse has a programmed state and an unprogrammed state and couples the first node to a first power supply when in the programmed state and decouples the first node from the first power supply when in the unprogrammed state. A second anti-fuse has a programmed state and an unprogrammed state and couples the first node to a second power supply when in the programmed state and decouples the first node from the second power supply when in the unprogrammed state. The state of the programmed signal can be used to replace a primary circuit element of an integrated circuit with a redundant circuit element.
10 Citations
17 Claims
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1. An integrated circuit comprising:
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an enabling type programmable circuit providing an enable signal having a programmed state and unprogrammed state; and at least one second type programmable circuit providing a programmed signal having a first state and a second state and prevented from being in a selected one of the first or second states in response to the enable signal being in the unprogrammed state, the at least one programmable circuit including a first anti-fuse and a second anti-fuse, wherein the programmed signal is in the first state in response to the enable signal being in the programmed state and the first anti-fuse being programmed and the programmed signal is in the second state in response to the enable signal being in the programmed state and the second anti-fuse being programmed, further wherein the first anti-fuse is programmed when the second anti-fuse is unprogrammed and the first anti-fuse is unprogrammed when the second anti-fuse is programmed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of programming an integrated circuit comprising the steps of:
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providing an enable signal having a programmed state and unprogrammed state; programming a selected one of a first anti-fuse or a second anti-fuse; and providing a programmed signal having a first state and a second state, wherein the programmed signal is prevented from being in a selected one of the first or second states in response to the enable signal being in the unprogrammed state, the programmed signal is in the first state in response to the enable signal being in the programmed state and the first anti-fuse being programmed, and the programmed signal is in the second state in response to the enable signal being in the programmed state and the second anti-fuse being programmed. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification