Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific voltage responsive fault sensor
Patent
1987-12-08
1989-08-15
Pellinen, A. D.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific voltage responsive fault sensor
361 92, 361 90, 361 56, 307549, 307557, 307560, 357 2313, H02H 904
Patent
active
048580554
ABSTRACT:
An input protecting device of a semiconductor circuit device has a first power supply terminal (8) for providing a first supply potential, a second power supply terminal (9) for providing a second supply potential, a signal input terminal (1), a first clamping diode (3) provided between the first power supply terminal (8) and the signal input terminal (1) for clamping a voltage larger than the first supply potential applied to the signal input terminal (1), and a second clamping diode (4) provided between the second power supply terminal (9) and the signal input terminal (1) for clamping a voltage smaller than the second supply potential applied to the signal input terminal (1). A switching device (12, 20 or 33) selectively cuts off a current path between the first clamping diode (3) and the signal input terminal (1) when a voltage is not applied to the first power supply terminal (8). As a result, even if a signal at "H" level is applied to the signal input terminal (1) when the supply potential is not applied to the first power supply terminal (8), a current is prevented from flowing in from the signal input terminal (1) through the first clamping diode (3).
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Mitsubishi Denki & Kabushiki Kaisha
Pellinen A. D.
Williams H. L.
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