Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1993-01-28
1995-03-14
Nguyen, Vinh
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 731, G01R 3128
Patent
active
053979842
ABSTRACT:
A semiconductor integrated circuit protected against a high voltage testing signal is provided. The integrated circuit includes a first-stage input circuit, a discriminating circuit, a power suppuly circuit and a connecting circuit. The input ends of the-input circuit and the discriminating circuit are connected to one preselected external terminal. The discriminating circuit renders a testing circuit drive signal active to activate when a testing instruction signal higher than an ordinary input signal voltage is applied to the external terminal. When the testing circuit drive signal is active, the power supply circuit disconnects at least one of the positive and negative poles of the power source having polarity opposite to that of the testing instruction signal from the input circuit, and the connecting circuit connects one of the positive and negative poles of the power source having the same polarity as that of the testing instruction signal to the output end of the input circuit.
REFERENCES:
patent: 5012185 (1991-04-01), Ohfuji
patent: 5142222 (1992-08-01), Tanaka et al.
patent: 5168219 (1992-12-01), Tanaka et al.
NEC Corporation
Nguyen Vinh
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