Circuit for resetting output of positive/negative high voltage g

Details Circuit for resetting output of positive/negative high voltage g Circuit for resetting output of positive/negative high voltage g

1997-06-04

1999-06-29

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327142, 327541, 327328, 307 75, 307 87, 36518523, 36518909, H03K 1720, G11C 1606

Patent

active

059173548

ABSTRACT:
When a state of outputting a third power supply potential to an output node is switched to a state of outputting a second power supply potential, connection between a supply unit of the second power supply potential and the output node is made through a first P-channel MOSFET. Further, when the first P-channel MOSFET is turned off, i.e., when the third power supply potential is output to the output node, the third power supply potential is also applied to a gate of the first P-channel MOSFET. Therefore, even when the potential of the output node rises to the third power supply potential, this transistor is not turned on. Thus, the second power supply potential and the output node are appropriately and electrically isolated from each other. The circuit can be used with a flash memory to prevent over programming.

REFERENCES:
patent: 4937787 (1990-06-01), Kobatake
patent: 5138190 (1992-08-01), Yamazaki et al.
patent: 5296765 (1994-03-01), Williams et al.
patent: 5341329 (1994-08-01), Takebuchi
patent: 5357476 (1994-10-01), Kuo et al.
patent: 5386422 (1995-01-01), Endoh et al.
patent: 5400287 (1995-03-01), Fuchigami
patent: 5513146 (1996-04-01), Atsumi et al.
patent: 5550494 (1996-08-01), Sawada
patent: 5592430 (1997-01-01), Ohtsuki
patent: 5770964 (1998-06-01), Suma

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