Semiconductor memory

Details Semiconductor memory Semiconductor memory

2008-09-26

2010-10-26

Ho, Hoai V (Department: 2827)

Static information storage and retrieval

Read/write circuit

Bad bit

C365S185090, C365S189070, C365S210100, C365S225700

Reexamination Certificate

active

07821854

ABSTRACT:
Address comparison circuits each compare the defect addresses programmed in the redundancy fuse circuits with an access address and output a redundancy signal when a comparison result is a match. A switch circuit is controlled to switch according to a redundancy selection signal output from a selection fuse circuit, and validates in response to the redundancy signal either a corresponding regular redundancy line or the reservation redundancy line. By dividing the redundancy lines into the regular redundancy lines and the reservation redundancy line, each of the redundancy fuse circuits can be made to correspond to one of the plurality of redundancy lines with the simple switch circuit. Therefore, a difference in propagation delay time of a signal can be made small and a difference in access time can be made small between when relieving a defect and when there is no defect.

REFERENCES:
patent: 4538245 (1985-08-01), Smarandoiu et al.
patent: 5617364 (1997-04-01), Hatakeyama
patent: 5677884 (1997-10-01), Zagar et al.
patent: 5740114 (1998-04-01), Hirano et al.
patent: 6065134 (2000-05-01), Bair et al.
patent: 6188618 (2001-02-01), Takase
patent: 6434064 (2002-08-01), Nagai
patent: 7046561 (2006-05-01), Tooher
patent: 7116590 (2006-10-01), Blodgett
patent: 7437625 (2008-10-01), Roohparvar
patent: 2002/0196681 (2002-12-01), Tanizaki
patent: 2004/0141387 (2004-07-01), Hanji et al.
patent: 6-44795 (1994-02-01), None
patent: 06044798 (1994-02-01), None
patent: 2000-11680 (2000-01-01), None
patent: 2001-035187 (2001-02-01), None
patent: 2002-15593 (2002-01-01), None
patent: 2003-007081 (2003-01-01), None
patent: 2004-220722 (2004-08-01), None
patent: 0197990 (1998-03-01), None

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