Circuit arrangement for protecting an input of an integrated cir

Details Circuit arrangement for protecting an input of an integrated cir Circuit arrangement for protecting an input of an integrated cir

1991-02-06

1992-10-20

Stephan, Steven L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 18, 361 56, 361 91, H02H 904

Patent

active

051575710

ABSTRACT:
A circuit arrangement for protecting an input of an integrated circuit (14) fed from a supply voltage source from overvoltages contains an input (26) which is connected to the input (12) of the integrated circuit to be protected. A four-layer diode (T1, T2) having two control terminals lies in parallel with the input (12) to be protected and a negative feedback resistor (R1) is connected in series with the four-layer diode. Connected to the one control terminal of the four-layer diode (T1, T2) is the control terminal of a controllable current drain element (T4) which is connected in parallel with the four-layer diode (T1, T2). For applying a reference voltage, the junction point of a series circuit comprising a diode (T3) and a constant current source (S) lying between the supply voltage and ground is connected to the other control terminal.

REFERENCES:
patent: 4686602 (1987-08-01), Bucksch
patent: 4691262 (1987-09-01), Chalfin
patent: 4698720 (1987-10-01), Finaurini
patent: 4704654 (1987-11-01), Aberle et al.
patent: 4868705 (1989-09-01), Shiochi et al.
patent: 4939616 (1990-07-01), Roontree
patent: 5012317 (1991-04-01), Rountre
patent: 5027181 (1991-06-01), Larik et al.
IBM Technical Disclosure Bulletin, vol. 15, No. 9 Feb. 1973, "Protective Circuit" by K. Helwig et al.

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