Patents Represented by Law Firm Morrison & Foerter LLP
  • Nonvolatile semiconductor memory device
    Patent number: 5677874
    Abstract: A nonvolatile semiconductor memory device requiring a plurality of power supply voltages for operation includes: a DC-DC converter for boosting a first power supply voltage of a first voltage level externally supplied; and a charge pumping circuit for further boosting an output voltage obtained as a result of boosting by the DC-DC converter so as to supply a second power supply voltage of a second voltage level.
    Type: Grant
    Filed: April 22, 1996
    Date of Patent: October 14, 1997
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Kaname Yamano