Integrated circuit memory device power supply circuits and methods of operating same

An integrated circuit device, comprising:

• a control circuit that selectively drives a power supply terminal of a memory cell array and sense amplifier of the integrated circuit device with a first power supply voltage and/or a second power supply voltage, delivered to the integrated circuit device separate from the first power supply voltage, responsive to a control signal.

A method of supplying power supply voltage in a semiconductor memory device, comprising:

• applying a second power supply voltage, applied from external to the semiconductor memory device separately from a first power supply voltage, to a data output circuit;
• and
• directly supplying the second power supply voltage to a memory cell array and sense amplifier circuit as a cell array internal voltage for operation of the memory cell array and sense amplifier.

A circuit for supplying cell array power supply voltage in a semiconductor memory device, said circuit comprising:

• a power supply providing line, said power supply providing line configured to directly supply a second power supply voltage, applied from external to the semiconductor memory device separately from a first power supply voltage, to a memory cell array and sense amplifier circuit as a cell array internal voltage for operation of the memory cell array and sense amplifier, wherein said first power supply voltage is for use in a core and a peripheral circuit of the semiconductor memory device and said second power supply voltage is for use in a data output circuit of the semiconductor memory device.

A method of supplying power supply voltage in a semiconductor memory device, comprising:

• applying a second power supply voltage applied from external to the semiconductor memory device separately from a first power supply voltage, to a data output circuit;
• and
• selectively applying a cell array internal voltage for operation of a memory cell array and sense amplifier circuit through a cell array internal voltage down converter or a second power supply voltage supplying part, said cell array internal voltage down converter being operated by the first power supply voltage and said second power supply voltage supplying part being configured to directly supply the second power supply voltage.

A circuit for supplying cell array power supply voltage in a semiconductor memory device, said circuit comprising:

• a cell array internal voltage down converter for receiving a first power supply voltage for use in a core and a peripheral circuit of the semiconductor memory device, generating a cell array internal voltage for operation of a memory cell array and sense amplifier of the semiconductor memory device, and outputting the cell array internal voltage to a cell array internal voltage supplying line;
• and
• a second power supply voltage supplying part activated in response to an operation control signal, said second power supply voltage supplying part being connected to the cell array internal voltage supplying line so as to directly supply, as the cell array internal voltage, a second power supply voltage, wherein said second power supply voltage is applied from external to the semiconductor memory device separately from the first power supply voltage.