Twin memory cell interconnection structure
First Claim
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1. A non-volatile memory, comprising:
- a first twin pair of memory cells, the first twin pair including first and second memory cells arranged in a first column, the first and second memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the first twin pair having respective gate terminals coupled to one another;
a second twin pair of memory cells, the second twin pair including third and fourth memory cells arranged in the first column, the third memory cell being adjacent to the second memory cell, the third and fourth memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the second twin pair having respective gate terminals coupled to one another;
a first bitline coupled to conduction terminals of the floating gate transistors of the first and fourth memory cells;
a second bitline coupled to conduction terminals of the floating gate transistors of the second and third memory cells;
a first word line coupled to the gate terminals of the selection transistors of the first twin pair; and
a second word line coupled to the gate terminals of the selection transistors of the second twin pair.
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Abstract
Non-volatile memory including rows and columns of memory cells, the columns of memory cells including pairs of twin memory cells including a common selection gate. According to the disclosure, two bitlines are provided per column of memory cells. The adjacent twin memory cells of the same column are not connected to the same bitline while the adjacent non-twin memory cells of the same column are connected to the same bitline.
10 Citations
20 Claims
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1. A non-volatile memory, comprising:
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a first twin pair of memory cells, the first twin pair including first and second memory cells arranged in a first column, the first and second memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the first twin pair having respective gate terminals coupled to one another; a second twin pair of memory cells, the second twin pair including third and fourth memory cells arranged in the first column, the third memory cell being adjacent to the second memory cell, the third and fourth memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the second twin pair having respective gate terminals coupled to one another; a first bitline coupled to conduction terminals of the floating gate transistors of the first and fourth memory cells; a second bitline coupled to conduction terminals of the floating gate transistors of the second and third memory cells; a first word line coupled to the gate terminals of the selection transistors of the first twin pair; and a second word line coupled to the gate terminals of the selection transistors of the second twin pair. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
fabricating a non-volatile memory on a semiconductor substrate, the memory including pairs of twin memory cells each memory cell including a floating gate transistor and a selection transistor including a selection gate common to the selection transistors of the twin memory cells, the method including; forming a first and a second column of memory cells including each of the pairs of twin memory cells; forming a first bitline aligned on a first bitline axis extending above the first column of memory cells; coupling the first bitline to the floating gate transistors of non-twin memory cells of the first column by a first conductive path; forming a second bitline aligned on the first bitline axis; coupling the second bitline to floating gate transistors of other non-twin memory cells of the first column by a second conductive path; forming a third bitline aligned on the first bitline axis; coupling the third bitline to floating gate transistors of non-twin memory cells of the second column by a third conductive path; forming a fourth bitline aligned on a second bitline axis extending above the second column of memory cells; and coupling the fourth bitline to the floating gate transistors of other non-twin memory cells of the second column by a fourth conductive path. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A non-volatile memory, comprising:
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a first twin pair of memory cells, the first twin pair including first and second memory cells arranged in a first column, the first and second memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the first twin pair having respective gate terminals coupled to one another; a second twin pair of memory cells, the second twin pair including third and fourth memory cells arranged in the first column, the third memory cell being adjacent to the second memory cell, the third and fourth memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the second twin pair having respective gate terminals coupled to one another; a third twin pair of memory cells, the third twin pair including fifth and sixth memory cells arranged in a second column, the fifth and sixth memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the third twin pair having respective gate terminals coupled to one another; a fourth twin pair of memory cells, the fourth twin pair including seventh and eighth memory cells arranged in the second column, the seventh memory cell being adjacent to the sixth memory cell, the seventh and eighth memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the fourth twin pair having respective gate terminals coupled to one another; a first bitline coupled to conduction terminals of the floating gate transistors of the first and fourth memory cells; a second bitline coupled to conduction terminals of the floating gate transistors of the second and third memory cells; a third bitline coupled to conduction terminals of the floating gate transistors of the fifth and eighth memory cells; and a fourth bitline coupled to conduction terminals of the floating gate transistors of the sixth and seventh memory cells, wherein the first, second and third bitlines are arranged along a first plane extending transverse to the first column of memory cells, and the fourth bitline is arranged along a second plane extending transverse to the second column of memory cells. - View Dependent Claims (19, 20)
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Specification