Signal input/output circuit for semiconductor integrated circuit

Details Signal input/output circuit for semiconductor integrated circuit Signal input/output circuit for semiconductor integrated circuit

1993-09-30

1995-05-02

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327434, H03K 17687

Patent

active

054122643

ABSTRACT:
A signal input/output circuit for a semiconductor integrated circuit being provided with a reset signal input/output terminal 1 which inputs external reset requesting signal REQ from the outside of the semiconductor integrated circuit 10 and outputs internal reset requesting signal TWD generated at the inside, and a reset signal input circuit 3 which is connected to the reset signal input/output terminal 1 through the protection resistance 4 and generates reset signal RST resetting the semiconductor integrated circuit 10 when the external reset requesting signal REQ is inputted to the reset signal input/output terminal 1. In addition, the signal input/output circuit includes a first N-channel transistor 6 whose source is connected to the ground voltage source of the semiconductor integrated circuit 10 and whose drain is connected to the end of the reset signal input/output terminal 1 side of a protection resistance 4, and with a second N-channel transistor 7 whose source is connected to the ground voltage source of the semiconductor integrated circuit 10, and whose drain is connected to the end of the reset signal input circuit 3 side of the same.

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