Step-up potential supply circuit and semiconductor storage devic

Details Step-up potential supply circuit and semiconductor storage devic Step-up potential supply circuit and semiconductor storage devic

1997-06-13

1999-06-01

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

327534, G05F 110

Patent

active

059091410

ABSTRACT:
An object is to obtain a step-up potential supply circuit which can supply a suitable step-up potential with suppressed power consumption even with a power-supply potential varying in a relatively large range. A 2Vcc charge pump circuit (1) is always kept in an active state. A power-supply potential detecting circuit (4) detects a power-supply potential Vcc. When the power-supply potential Vcc is under a first comparison potential, a switching signal SS at "L" is outputted to turn on a switch portion (3). Then a 2Vcc charge pump circuit (2) enters an active state and a step-up potential Vpp is supplied with a relatively large first charge supply capability. When the power-supply potential Vcc is above the first comparison potential, the switching signal SS is outputted at "H" to turn off the switch portion (3). Then the 2Vcc charge pump circuit enters an inactive state and the step-up potential Vpp is supplied with a relatively small second charge supply capability.

REFERENCES:
patent: 5602794 (1997-02-01), Javanifard et al.
patent: 5767735 (1998-06-01), Javanifard et al.

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