Circuit for permanently adjusting a circuit element value in a s

Details Circuit for permanently adjusting a circuit element value in a s Circuit for permanently adjusting a circuit element value in a s

1996-06-24

1998-06-16

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Fusible link or intentional destruct circuit

H01H 8500, H03K 19003

Patent

active

057677328

ABSTRACT:
In a semiconductor integrated circuit, an internal passive circuit element value, such as a resistance, is permanently configured to a desired value by selectively fusing one or more fusing elements in response to corresponding input signals. An internal monitor circuit determines whether or not all of the requested fusing operations were successfully completed and, if so, permanently inhibits any further fusing operations. The circuit has the advantage of obviating external measurement of the adjusted circuit element value and further obviates the need for application of a lock input signal to inhibit further fusing operations. Accordingly, testing is simplified and the number of external pins is reduced.

REFERENCES:
patent: 4814640 (1989-03-01), Miyake
patent: 4935645 (1990-06-01), Lee
patent: 4937465 (1990-06-01), Johnson et al.
patent: 5404049 (1995-04-01), Canada et al.
patent: 5448199 (1995-09-01), Park
patent: 5450030 (1995-09-01), Shin et al.
patent: 5469077 (1995-11-01), Cox
patent: 5517455 (1996-05-01), McClure et al.

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