Memory circuit (100) comprising: a first
memory cell array (102) on a first layer (F); a second
memory cell array on a second layer (F) that is distinct from the first layer (F); a first selection
transistor array (104) on a third layer (F) that is distinct from the first layer (F) and the second layer (F); a second selection
transistor array (106) on a fourth layer (F) that is distinct from the first layer (F), the second layer (F), and the third layer (F); a first set of bit lines (BL) extending in a first direction (Z) that are coupled to the first
memory cell array (102), the second memory
cell array, and the first selection
transistor array (104); a second set of bit lines (BL) extending in the first direction (Z) and connected to the first memory
cell array (102) and the second memory
cell array through the first selection
transistor array (104) are coupled;a first set of
source lines (SL) extending in the first direction (Z) coupled to the first memory cell array (102), the second memory cell array, and the second select
transistor array (106), and separated from the first set of bit lines (BL) in a second direction (X) that differs from the first direction (Z); and a second set of
source lines (SL) extending in the first direction (Z) and coupled to the first memory cell array (102) and the second memory cell array through the second select
transistor array (106), wherein the first select transistor array (104) has: a first select line (SG) extending in the second direction (X);and a first selection transistor (212) comprising a first gate, a first drain and a first source, wherein the first gate is coupled to the first selection line (SG), the first drain is coupled to a first
bit line (BL) of the first set of bit lines (BL) and the first source is coupled to a first
bit line (BL) of the second set of bit lines (BL), wherein the first memory cell array (102) comprises: a first word line (WL) extending in the second direction (X);and a first n-transistor having a second gate, a second drain and a
second source, the second gate being coupled to the first word line (WL), the second drain being coupled to the first drain by the first
bit line (BL) of the first set of bit lines (BL) and the
second source being coupled to a first source line (SL) of the first set of
source lines (SL), and wherein the second memory cell array has: a second word line (WL) extending in the second direction and separated from the first word line in the first direction;and a second n-transistor having a third gate, a third drain and a third source, wherein the third gate is coupled to the second word line (WL), the third drain is coupled to the first drain and the second drain by the first bit line (BL) of the first set of bit lines (BL) and the third source is coupled to the
second source by the first source line (SL) of the first set of source lines (SL), and wherein the second select transistor array (106) has: a second select line (SG) extending in the second direction (X) and separated from the first select line (SG) in the first direction (Z);and a second selection transistor (214) having a fourth gate, a fourth drain and a fourth source, wherein the fourth gate is coupled to the second selection line (SG), the fourth drain is coupled to a first source line (SL) of the second set of source lines (SL) and the fourth source is coupled to the second source and the third source by the first source line (SL) of the first set of source lines (SL), wherein the first layer (F) is above the second layer (F), the second layer (F) is above the third layer (F) and the third layer (F) is above the fourth layer (F).