Circuit arrangement for protecting an input of an integrated circuit fed from a supply voltage source from overvoltages
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United States of America Patent
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Oct 20, 1992
Grant Date -
N/A
app pub date -
Feb 6, 1991
filing date -
Feb 14, 1990
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A circuit arrangement for protecting an input of an integrated circuit (14) fed from a supply voltage source from overvoltages contains an input (26) which is connected to the input (12) of the integrated circuit to be protected. A four-layer diode (T1, T2) having two control terminals lies in parallel with the input (12) to be protected and a negative feedback resistor (R1) is connected in series with the four-layer diode. Connected to the one control terminal of the four-layer diode (T1, T2) is the control terminal of a controllable current drain element (T4) which is connected in parallel with the four-layer diode (T1, T2). For applying a reference voltage, the junction point of a series circuit comprising a diode (T3) and a constant current source (S) lying between the supply voltage and ground is connected to the other control terminal.
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