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 a second column, the third memory cell being adjacent to the first memory cell, the fourth 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 a conduction terminal of the floating gate transistor of the first memory cell;
a second bitline coupled to a conduction terminal of the floating gate transistor of the second memory cell;
a third bitline coupled to a conduction terminal of the floating gate transistor of the third memory cell;
a fourth bitline coupled to a conduction terminal of the floating gate transistor of the fourth memory cell, the first, second, third, and fourth bitlines being different from one another; and
a first word line coupled to the gate terminals of the selection transistors of the first and second twin pairs.
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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.
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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 a second column, the third memory cell being adjacent to the first memory cell, the fourth 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 a conduction terminal of the floating gate transistor of the first memory cell; a second bitline coupled to a conduction terminal of the floating gate transistor of the second memory cell; a third bitline coupled to a conduction terminal of the floating gate transistor of the third memory cell; a fourth bitline coupled to a conduction terminal of the floating gate transistor of the fourth memory cell, the first, second, third, and fourth bitlines being different from one another; and a first word line coupled to the gate terminals of the selection transistors of the first and second twin pairs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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forming first and second memory cells in a first column, the first and second memory cells each including a respective selection transistor and a respective floating gate transistor; coupling respective gate terminals of the selection transistors of the first and second memory cells to one another; forming third and fourth memory cells in a second column, adjacent to the first column, the third and fourth memory cells each including a respective selection transistor and a respective floating gate transistor; coupling respective gate terminals of the selection transistors of the third and fourth memory cells to one another; forming first, second, third and fourth bitlines, the first, second, third and fourth bitlines being different from one another; coupling the first bitline to a conduction terminal of the floating gate transistor of the first memory cell; coupling the second bitline to a conduction terminal of the floating gate transistor of the second memory cell; coupling the third bitline to a conduction terminal of the floating gate terminal of the third memory cell; and coupling the fourth bitline to a conduction terminal of the floating gate transistor of the fourth memory cell. - View Dependent Claims (13, 14, 15)
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16. A non-volatile memory, comprising:
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a first column of memory cells, the first column including first and second memory cells each including a respective selection transistor and a respective floating gate transistor, the selection transistors of the first and second memory cells having respective gate terminals coupled to one another; a second column of memory cells, the second column including third and fourth memory cells, the third memory cell being adjacent to the first memory cell, the fourth 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 third and fourth memory cells having respective gate terminals coupled to one another; a first bitline coupled to a conduction terminal of the floating gate transistor of the first memory cell; a second bitline coupled to a conduction terminal of the floating gate transistors of the second memory cell; a third bitline coupled to a conduction terminal of the floating gate transistor of the third memory cell; and a fourth bitline coupled to a conduction terminal of the floating gate transistor of the fourth memory cell, the first, second, third, and fourth bitlines being different from one another. - View Dependent Claims (17, 18, 19, 20)
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Specification