Julia Lai Chan

US Patent:

60026049, Dec 14, 1999

Filed:

Nov 10, 1997

Appl. No.:

8/968699

Inventors:

Julia Shau-Chang Chan - Saratoga CA
Chao-Hung Chang - Santa Clara CA
Paul Jei-Zen Song - Sunnyvale CA

Assignee:

Integrated Silicon Solution, Inc. - Santa Clara CA

International Classification:

H02M 110
G11C 1300

US Classification:

363142

Abstract:

A 5V generator circuit is disclosed that generates a reliable 5V signal for use in integrated circuits from the available VPP or VCC supplies for a wide range of VPP and VCC voltages. When VCC is greater than approximately 4V, the generator circuit generates the 5V signal directly from VCC. When VCC is less than approximately 4V and VPP is greater than approximately 4V but less than about 9V, the generator circuit generates the 5V signal directly from VPP. When VCC is less than approximately 4V and VPP is greater than approximately 9V, the generator produces the 5V signal at approximately half of the voltage level of the VPP signal. When both VCC and VPP are less than about 4V, the 5V signal is generated at the too-low VCC level.