Circuit for cancelling and replacing redundant elements

Details Circuit for cancelling and replacing redundant elements Circuit for cancelling and replacing redundant elements

1998-08-13

1999-06-15

Wells, Kenneth B.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Redundant

326 38, 3652257, 327525, G11C 1716

Patent

active

059125799

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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