Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-02-03
1999-11-23
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327546, 327504, G05F 110
Patent
active
059907312
ABSTRACT:
Input/output circuitry for electrically protecting an internal element includes an input/output terminal connected to the internal element, a pair of first and second power terminals applied with a bias voltage, a series connection of a diode and a bipolar transistor between the pair of first and second power terminals so that an intermediate point between the diode and the bipolar transistor is connected to the input terminal, and a parasitic resistance connected between a base of the bipolar transistor and the diode so that the diode is connected between the parasitic resistance and an emitter of the bipolar transistor. An electrostatic pulse applied to the input/output terminal is clamped by the series connection of the diode and the bipolar transistor to protect the internal element from an electrostatic pulse applied to the input/output terminal.
REFERENCES:
patent: 5059782 (1991-10-01), Fukuyama
patent: 5289056 (1994-02-01), Keown et al.
patent: 5424673 (1995-06-01), Edwards et al.
patent: 5461297 (1995-10-01), Crawford
patent: 5591992 (1997-01-01), Leach
patent: 5594382 (1997-01-01), Kato et al.
patent: 5821528 (1998-10-01), Liao et al.
patent: 5875089 (1999-02-01), Higashide et al.
Callahan Timothy P.
Luu An T
NEC Corporation
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