Protection circuit

Details Protection circuit Protection circuit

2011-01-25

2011-01-25

Dang, Phuc T (Department: 2892)

Active solid-state devices (e.g., transistors, solid-state diode

Regenerative type switching device

Device protection

C257S197000, C257S566000, C438S170000, C438S189000

Reexamination Certificate

active

07875904

ABSTRACT:
In a protection circuit of an input/output terminal I/O, three types of PNP bipolar transistors are included. In a first PNP type bipolar transistor10A, the emitter thereof is connected to the input/output terminal I/O, the base thereof is connected to a high-potential power supply terminal VDD, and the collector thereof is connected to a low-potential power supply terminal VSS. In a second PNP type bipolar transistor10B, the emitter thereof is connected to the input/output terminal I/O, and the base and the collector thereof are connected to the high-potential power supply terminal VDD. In a third PNP type bipolar transistor10C, the emitter thereof is connected to the low-potential power supply terminal VSS, and the base and the collector thereof are connected to the high-potential power supply terminal VDD.

REFERENCES:
patent: 6049119 (2000-04-01), Smith
patent: 6323523 (2001-11-01), Lee et al.
patent: 6555878 (2003-04-01), Song et al.
patent: 7291888 (2007-11-01), Huang
patent: 7570027 (2009-08-01), Teramoto et al.
patent: 2008/0174924 (2008-07-01), Kang et al.
patent: 2001-223277 (2001-08-01), None

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