Circuit for cancelling and replacing redundant elements
First Claim
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1. A method of repairing an integrated circuit, the method comprising the steps of;
- programming a first redundant element to respond to an address of a defective selectively addressable primary element;
one time enabling the first redundant element;
permanently disabling the first redundant element after the step of one time enabling the first redundant element;
programming a second redundant element to respond to an address of the defective selectively addressable primary element; and
one time enabling the second redundant element.
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Abstract
In an integrated circuit having addressable primary elements and redundant elements which can be programmed to replace primary elements, a circuit and method are provided for cancelling and replacing redundant elements. A circuit is described which can be used in a memory such as a dynamic random access memory (DRAM) which uses a selectively blowable anti-fuse to disable a redundant element which was previously programmed to replace a defective primary element. The disclosure describes a method for permanently cancelling the defective redundant element and replacing the defective redundant element with another redundant element.
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Citations
4 Claims
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1. A method of repairing an integrated circuit, the method comprising the steps of;
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programming a first redundant element to respond to an address of a defective selectively addressable primary element; one time enabling the first redundant element; permanently disabling the first redundant element after the step of one time enabling the first redundant element; programming a second redundant element to respond to an address of the defective selectively addressable primary element; and one time enabling the second redundant element. - View Dependent Claims (2, 3, 4)
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Specification