Memory device and memory system having the same

A memory device, comprising:

• a memory cell array coupled to a plurality of bit lines spaced apart from each other in a first direction and extending in a second direction perpendicular to the first direction;
• and
• peripheral circuits located under the memory cell array in a third direction perpendicular to the first and second directions,
• wherein the peripheral circuits comprise:
• a plurality of page buffers arranged in a matrix format in the first and second directions and coupled to the plurality of bit lines, respectively;
• a first storage group coupled to a first group of the page buffers;
• a second storage group coupled to a second group of the page buffers;
• and
• a switch circuit arranged between and coupled to the first and second storage groups, and coupling the first or second storage group to data lines.

A memory system, comprising:

• a memory device storing data;
• and
• a memory controller communicating between a host and the memory device,
• wherein the memory device comprises:
• page buffers arranged in a first direction and a second direction perpendicular to the first direction;
• a first storage group and a second storage group arranged adjacent to the page buffers in the second direction;
• and
• a switch circuit arranged between the first storage group and the second storage group and coupling a selected storage group between the first and second storage groups to data lines.