Circuit for cancelling and replacing redundant elements

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

1997-02-28

1997-10-14

Zarabian, A.

Static information storage and retrieval

Read/write circuit

Bad bit

365 96, G11C 700

Patent

active

056778848

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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