Method and apparatus for protecting eFuse information

Details Method and apparatus for protecting eFuse information Method and apparatus for protecting eFuse information

2006-10-31

2006-10-31

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Fusible link or intentional destruct circuit

C365S225700

Reexamination Certificate

active

07129769

ABSTRACT:
A method and apparatus are provided for protecting electronic fuse (eFuse) information. A current balancing circuit is provided that maintains a constant current demand on the eFuse voltage supply that is sufficient to blow an eFuse. Normally the constant current is applied to a semiconductor core. When an eFuse is being blown, the constant current is diverted away from the core to the eFuse and as the eFuse blows, the constant current is again dumped to the semiconductor core. Thus, a change in current due to the transient of the eFuse being blown is not detectable and the information that an eFuse has been blown is kept secure.

REFERENCES:
patent: 6201750 (2001-03-01), Busch et al.

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