Patent ID: 7656737
Filing Date: 2010-02-02
Classification: G11C

Abstract:
1. A pumping circuit for multiple nonvolatile memories, comprising: a charge pump, for pumping up a first voltage to be a second voltage; a first high voltage pass block, coupled to an output port of said charge pump, for receiving a first enabling signal and outputting the second voltage for one of the nonvolatile memories when the first enabling signal is activating; a first PMOS, coupled to an output port of said first high voltage pass block, for receiving the first enabling signal and outputting the first voltage for the one of the nonvolatile memories when the first enabling signal is deactivating; a second high voltage pass block, coupled to the output port of said charge pump, for receiving a second enabling signal and outputting the second voltage for another one of the nonvolatile memories when the second enabling signal is activating; a second PMOS, coupled to an output port of said second high voltage pass block, for receiving the second enabling signal and outputting the first voltage for the another one of the nonvolatile memories when the second enabling signal is deactivating; a voltage source switch, for switching the first and the second enabling signals to introduce the first voltage and the second voltage to said non-volatile memories; wherein said first and second high voltage pass block further respectively comprises a local booster and a gate controlled by the local booster; and wherein, said first voltage is lower than said second voltage.