Static information storage and retrieval – Read/write circuit – Having fuse element
Patent
2000-02-25
2000-12-26
Mai, Son
Static information storage and retrieval
Read/write circuit
Having fuse element
365200, G11C 700
Patent
active
061669814
ABSTRACT:
A memory device that includes a plurality of data storage cells; at least one redundancy data storage cell; a redundancy match detection circuit; and a means for coupling programmable fuses to the redundancy match detection circuit, wherein a defective data storage is replaced by one redundancy data storage when the redundancy match detection detects a pre-determined condition set by said programmable fuse is described. Decoding is accomplished by a data bus selecting the e-fuse to be blown. The data bus is also used for reading the state of the e-fuses to ensure that the e-fuses are correctly blown. Power is effectively applied to the selected e-fuses while sharing the data bus for e-fuse decoding and verification. In order to reduce the number of communication channels between e-fuses and the redundancy match detection circuitry, the transfer operation uses time multiplexing, allowing e-fuse information to be transferred to the redundancy match detection circuitry sequentially. The actual time multiplexing operation for performing the transfer is preferably enabled only after the chip power-up state.
REFERENCES:
patent: 6067268 (2000-05-01), Lee
patent: 6088281 (2000-07-01), Miyakawa et al.
patent: 6094386 (2000-07-01), Kohyama
Daniel Gabriel
Kirihata Toshiaki
International Business Machines - Corporation
Mai Son
Schnurmann H. Daniel
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