Patent ID: 7269087
Filing Date: 2007-09-11
Classification: G11C

Abstract:
1. A semiconductor memory device comprising: a first memory array including a plurality of first memory cells arranged at intersections of a plurality of first word lines and a first bit line; a second memory array including a plurality of second memory cells arranged at intersections of a plurality of second word lines and a second bit line and a plurality of third memory cells arranged at intersections of the plurality of second word lines and a third bit line; a third memory array including a plurality of fourth memory cells arranged at intersections of a plurality of third word lines and a fourth bit line; a first sense amplifier coupled to the first bit line and the second bit line, a second sense amplifier coupled to the third bit line and the fourth bit line; a first IO line pair, one line of the first IO line pair being coupled to the first bit line via a first switch MOSFET and the other line of the first IO line pair being coupled to the second bit line via a second switch MOSFET; and a second IO line pair, one line of the second IO line pair being coupled to the third bit line via a third switch MOSFET and the other line of the second IO line pair being coupled to the fourth bit line via a fourth switch MOSFET, a Y select signal line coupled to gates of the first to fourth switch MOSFETs, wherein the first sense amplifier amplifies a voltage difference between the first and second bit lines and the second sense amplifier amplifies a voltage difference between the third and fourth bit lines, wherein the first switch MOSFET is arranged between the first memory array and the first sense amplifier, wherein the second switch MOSFET is arranged between the second memory array and the first sense amplifier, wherein the third switch MOSFET is arranged between the second memory array and the second sense amplifier, and wherein the fourth switch MOSFET is arranged between the third memory array and the second sense amplifier.