Protection circuit device for a semiconductor integrated circuit

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode

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Details

257362, 257591, 257497, 361 90, 361 68, H01L 2362

Patent

active

055148948

ABSTRACT:
A protection circuit structure for an internal semiconductor integrated circuit. The protection circuit structure includes a first protection circuit having at least a first input pin and a first discharge pin, a second protection circuit having at least a second input pin and a second discharge pin and a switching device connecting between the first and second protection circuits. The switching device is biased by a potential difference between the first and second discharge pins. The switching device permits operating one of the first and second protection circuits to accomplish a discharge in replacement of an inoperative first or second discharge pin. The switching device takes the ON state when biased by a predetermined voltage or higher which interrupts the internal semiconductor integrated circuit. The switching device connects between wiring lines which respectively connect to the first and second discharge pins.

REFERENCES:
patent: 4952994 (1990-08-01), Lin
patent: 5027250 (1991-06-01), Cini et al.
patent: 5061649 (1991-10-01), Takenouchi et al.
patent: 5200876 (1993-04-01), Takeda

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