Electrical fuse self test and repair

Details Electrical fuse self test and repair Electrical fuse self test and repair

2007-11-14

2009-06-09

Nguyen, Tan T. (Department: 2827)

Static information storage and retrieval

Read only systems

Fusible

C365S189020, C365S201000, C365S225700

Reexamination Certificate

active

07545666

ABSTRACT:
A circuit for testing and repairing a fuse device having a plurality of fuse units and being able to serially input and output data is disclosed, the circuit comprises a first multiplexer configured to select either a true or an inverted data for being stored in the fuse device, a second multiplexer configured to select either a true or an inverted data being read out from the fuse device, a storage unit configured to store information of faulty fuse units, and an indication bit being programmed to reflect a comparison between the data intended to be stored in the fuse device and the stored faulty unit information, wherein when the indication bit is at a first state, the first and second multiplexers select the true data, and when the indication bit is at a second state, the first and second multiplexers select the inverted data.

REFERENCES:
patent: 6151238 (2000-11-01), Smit et al.
patent: 6292422 (2001-09-01), Pitts
patent: 6754113 (2004-06-01), Ma et al.

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