Output circuit of semiconductor device

Details Output circuit of semiconductor device Output circuit of semiconductor device

1997-01-24

1998-10-20

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327108, 327538, 327541, 327 55, 365226, H03K 190175

Patent

active

058252215

ABSTRACT:
An improved output circuit that provides an output signal having a predetermined high voltage level regardless of the voltage of a high-potential power supply is described. In one embodiment, the invention includes a first transistor and a second transistor connected in series between a high-potential power supply and a low-potential power supply, and a third transistor connected in parallel to the first transistor between the high-potential power supply and the node between the first and second transistors. The first and second transistors are n-type MOS transistors and the third transistor is a p-type MOS transistor. In another embodiment, the invention further includes a supply voltage detector for detecting a voltage of the high-potential power supply and supplying a voltage signal to the first and third transistors for selectively enabling one of the first and third transistors based on the voltage detected.

REFERENCES:
patent: 5488326 (1996-01-01), Shiraishi et al.

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