Protection circuit for integrated circuit devices

Details Protection circuit for integrated circuit devices Protection circuit for integrated circuit devices

H - Electricity

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328/198

H01L 27/06 (2006.01) H01L 27/02 (2006.01) H01L 27/07 (2006.01) H02H 7/20 (2006.01) H03K 17/08 (2006.01) H03K 17/0814 (2006.01)

Patent

CA 1179406

RCA 76,431/76,431 PROTECTION CIRCUIT FOR INTEGRATED CIRCUIT DEVICES ABSTRACT OF THE DISCLOSURE Disclosed is a protection circuit which may be used, for example, in a television receiver to protect circuitry inside an integrated circuit from damage due to high-voltage transients. The protection circuit comprises a PNPN structure forming a silicon control rectifier (SCR) and a resistive element integral to the SCR structure. In one embodiment the resistive element is a linear resistor and in another embodiment is a non-linear resistive element in the form of a diode-connected transistor. The SCR and the resistive element are arranged to form a two-terminal, high-current protection circuit which is rendered conductive when the potential difference across the two terminals is greater than one forward-biased PN junction voltage drop. One terminal of the protection circuit is connected to an input or output terminal of the protected circuit, and the other terminal is connected to the most positive power supply potential. Transient voltages appearing at the integrated circuit terminal greater than one PN junction voltage drop above the positive power supply potential cause the protection circuit to conduct current, thereby dissipating the energy of the high-voltage transient and protecting the integrated circuit from damage.

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