Memory device, operating method thereof, and data storage device including the same

An operating method of a memory device, comprising:

• receiving an address;
• pre-decoding the received address;
• determining whether the received address is included in an operating address range allocated for accessing the memory device, based on a result of pre-decoding the received address;
• and
• controlling an input/output buffer block of the memory device whether the input/output buffer block of the memory device is activated or deactivated, based on the determining result.

A data storage device comprising:

• a multi-chip package memory device including a plurality of memory devices;
• and
• a controller configured to control the multi-chip package memory device,
• wherein each of the plurality of memory devices comprises:
• a data read/write block configured to store data in memory cells and read data from the memory cells;
• an input/output buffer block configured to buffer input data inputted through data pads and control signals inputted through control signal pads, and provide buffered input data and control signals to the data read/write block, and buffer read data read out through the data read/write block, and output buffered read data to an external device through the data pads;
• and
• a control logic configured to activate or deactivate the input/output buffer block based on an address which is inputted from the external device.