Double transistor switch for supplying multiple voltages to flas

Details Double transistor switch for supplying multiple voltages to flas Double transistor switch for supplying multiple voltages to flas

1998-06-19

2000-04-11

Zarabian, A.

Static information storage and retrieval

Powering

36518523, G11C 700

Patent

active

060494980

ABSTRACT:
The present invention is directed to a method and apparatus for switching a selected one of a plurality of voltage supplies, each having a respective amplitude, to a wordline of a Flash memory, while providing isolation between the other unswitched voltage supplies and the wordline. By utilizing two symmetrically configured switching transistors, a selected supply voltage can be passed to the wordline when the transistors are on, and the non-selected supply voltages will be reliably isolated from the wordline when the transistors are off regardless of the polarity of the voltage difference between the non-selected voltage supplies and the wordline.

REFERENCES:
patent: 4228528 (1980-10-01), Cenker et al.
patent: 4823318 (1989-04-01), D'Arrigo
patent: 5682348 (1997-10-01), Lin

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