Semiconductor integrated circuit having input protection circuit

Details Semiconductor integrated circuit having input protection circuit Semiconductor integrated circuit having input protection circuit

1998-02-25

2000-03-07

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

H02H 900

Patent

active

060348542

ABSTRACT:
In an input protection circuit for use in a semiconductor integrated circuit, a switch device 4, which becomes a conducting condition in response to an overvoltage applied between opposite ends thereof, is connected between a wiring conductor connecting an external input terminal 7 to an input node of an input first stage inverter 5 and an output node N3 of a logic gate 10 included within an internal circuit 3 provided in the semiconductor integrated circuit. When an overvoltage is applied to the external input terminal 7, the switch device 4 becomes the conducting condition so that the electric charge of the overvoltage applied to the external input terminal 7, is discharged through a MOS transistor QP6 or QN7 constituting the logic gate 10 within the internal circuit 3, to a power supply voltage line 1A or a ground potential line 2A which is laid within the internal circuit 3 for supplying a power supply voltage or a ground potential to the MOS transistor QP6 or QN7. Thus, an effective input protection circuit can be realized with a reduced occupying area on the semiconductor chip, with a reduced increase of the input terminal capacitance and with a reduced restriction to the circuit layout.

REFERENCES:
patent: 5841619 (1998-11-01), Shigehara et al.

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