Nonvolatile memory apparatus
First Claim
1. A nonvolatile memory apparatus comprising:
- a memory array having a plurality of nonvolatile memory cells;
a stepped-up/down power supply circuit for generating a first voltage for supplying to a nonvolatile memory cell from an external power voltage; and
a stepped-down power supply unit for generating a second voltage for supplying to an internal circuit from the external power voltage, wherein in an operating mode, said stepped-down power supply unit generates the second voltage by stepped down from the external power voltage and supplies the second voltage to said internal logical circuits, and wherein in a standby mode, said stepped-down power supply unit determines the level of the external power voltage, and when the external power voltage is lower than a determination voltage level, supplies the external power voltage as the second voltage to said internal logical circuits, and when the external power voltage is higher than the determination voltage level, supplies a level shifted voltage, which is level shifted by the threshold voltage of a first MOS transistor, from the external power voltage as the second voltage to said internal logical circuits.
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Accused Products
Abstract
Current consumption in a nonvolatile memory apparatus operable on two or more different power voltages is to be substantially reduced in its standby mode. A stepped-down power supply unit provided in a flash memory to generate an internal power voltage, when supplied from outside with about 3.3 V as a power voltage, causes a first stepped-down power supply circuit to output the internal power voltage to control circuits when in normal operation. In a low power consumption mode, a second stepped-down power supply circuit outputs the internal power voltage to the control circuits, and in a standby mode a third stepped-down power supply circuit outputs to the control circuits an internal power voltage stepped down by an N-channel MOS transistor.
33 Citations
7 Claims
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1. A nonvolatile memory apparatus comprising:
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a memory array having a plurality of nonvolatile memory cells;
a stepped-up/down power supply circuit for generating a first voltage for supplying to a nonvolatile memory cell from an external power voltage; and
a stepped-down power supply unit for generating a second voltage for supplying to an internal circuit from the external power voltage, wherein in an operating mode, said stepped-down power supply unit generates the second voltage by stepped down from the external power voltage and supplies the second voltage to said internal logical circuits, and wherein in a standby mode, said stepped-down power supply unit determines the level of the external power voltage, and when the external power voltage is lower than a determination voltage level, supplies the external power voltage as the second voltage to said internal logical circuits, and when the external power voltage is higher than the determination voltage level, supplies a level shifted voltage, which is level shifted by the threshold voltage of a first MOS transistor, from the external power voltage as the second voltage to said internal logical circuits. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification