Volatile memory device

A volatile memory device comprising:

• a row decoder extending in a first direction;
• a column decoder extending in a second direction;
• and
• a memory cell array between the row decoder and the column decoder,
• wherein the memory cell array includes:
• a center region including a first sense amplifier, a first mat including a first bit line connected to the first sense amplifier, and a second mat including a first complementary bit line connected to the first sense amplifier;
• and
• a first edge region disposed in the first direction from the center region,
• wherein the first edge region includes a second sense amplifier and a third mat including a second bit line connected to the second sense amplifier and disposed in a third direction opposite to the first direction from the second sense amplifier, and
• the second sense amplifier is connected to the first complementary bit line of the center region.

A volatile memory device comprising:

• a first sense amplifier;
• a second sense amplifier spaced apart from the first sense amplifier in a first direction;
• a third sense amplifier spaced apart from the first sense amplifier in the first direction and spaced apart from the second sense amplifier in a second direction;
• a first mat formed between the first sense amplifier and the second sense amplifier and including a first bit line connected to the first sense amplifier and a second bit line connected to the second sense amplifier;
• a second mat formed between the first sense amplifier and the third sense amplifier and including a first complementary bit line connected to the first sense amplifier and a third bit line connected to the third sense amplifier;
• a third mat spaced apart from the second sense amplifier in the first direction and including a second complementary bit line connected to the second sense amplifier;
• a fourth mat spaced apart from the third sense amplifier in the first direction and including a third complementary bit line connected to the third sense amplifier;
• a first word line connected to the first mat and the fourth mat;
• and
• a second word line connected to the second mat and the third mat.