Input protection circuit device

Details Input protection circuit device Input protection circuit device

1996-04-22

1999-02-23

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

361 56, 257355, H02H 322

Patent

active

058750894

ABSTRACT:
An input protection circuit device for protecting a device in a semiconductor circuit device when a surge current is applied to a signal input terminal of the semiconductor circuit device is provided. The input circuit device includes an nMOS transistor between an input signal line connecting an input pad and an internal circuit and a first power supply (Vcc), and having a gate electrode connected to GND via a resistor-C, and a diode between the input signal line and GND. When a positive surge current higher than the potential of the first power supply (Vcc) is applied to the input pad, and when a negative surge current lower than the potential of GND is applied, the surge current is moderated by the nMOS transistor and by the diode, respectively, to prevent the flow of the surge current to the internal circuit.

REFERENCES:
patent: 4736271 (1988-04-01), Mack et al.
patent: 5079612 (1992-01-01), Takamoto et al.
patent: 5596216 (1997-01-01), Yanagigawa
patent: 5610790 (1997-03-01), Staab et al.
patent: 5629545 (1997-05-01), Leach

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