NAND based NMOS NOR flash memory cell, a NAND based NMOS nor flash memory array, and a method of forming a NAND based NMOS NOR flash memory array
First Claim
1. A NOR flash nonvolatile memory circuit comprising:
- a plurality of charge retaining transistors serially connected in a NAND string;
wherein a drain of a topmost charge retaining transistor is connected to a bit line associated with the plurality of serially connected charge retaining transistors;
wherein a source of a bottommost charge retaining transistor is connected to a source line associated with the plurality of charge retaining transistors; and
wherein a control gate of each of the plurality of charge retaining transistors is connected to a word line.
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Accused Products
Abstract
A NOR flash nonvolatile memory device provides the memory cell size and a low current program process of a NAND flash nonvolatile memory device and the fast, asynchronous random access of a NOR flash nonvolatile memory device. The NOR flash nonvolatile memory device has an array of NOR flash nonvolatile memory circuits. Each NOR flash nonvolatile memory circuit includes a plurality of charge retaining transistors serially connected in a NAND string. A drain of a topmost charge retaining transistor is connected to a bit line associated with the serially connected charge retaining transistors and a source of a bottommost charge retaining transistor is connected to a source line associated with the charge retaining transistors. Each control gate of the charge retaining transistors on each row is commonly connected to a word line. The charge retaining transistors are programmed and erased with a Fowler-Nordheim tunneling process.
140 Citations
95 Claims
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1. A NOR flash nonvolatile memory circuit comprising:
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a plurality of charge retaining transistors serially connected in a NAND string; wherein a drain of a topmost charge retaining transistor is connected to a bit line associated with the plurality of serially connected charge retaining transistors; wherein a source of a bottommost charge retaining transistor is connected to a source line associated with the plurality of charge retaining transistors; and wherein a control gate of each of the plurality of charge retaining transistors is connected to a word line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A NOR flash nonvolatile memory device comprising:
an array of a plurality of NOR flash nonvolatile memory circuits arranged in rows and column, wherein each of the nonvolatile memory circuits comprise; a plurality of charge retaining transistors on each column are connected serially in a NAND string; wherein a drain of a topmost charge retaining transistor of each NOR flash memory circuit is connected to a local bit line associated with the column on which each NOR flash memory circuit resides; wherein a source of a bottommost charge retaining transistor of each of the NOR flash memory circuits is connected to a local source line associated with the on which each NOR flash memory circuit; and wherein each control gate of the charge retaining transistors on each row are commonly connected to a word line. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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45. A method for forming a NOR flash nonvolatile memory device comprises the steps of:
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providing a substrate; and forming an array of a plurality of NOR flash nonvolatile memory circuits configured in rows and columns, wherein for the NOR flash nonvolatile memory circuits are formed by the steps of; forming a plurality of charge retaining transistors such that the charge retaining transistors are placed the rows and columns, connecting the plurality of charge retaining transistors on a column serially in a NAND string, connecting a drain of a topmost charge retaining transistor of each NOR flash memory circuit to a local bit line associated with the column on which each NOR flash memory circuit resides, connecting a source of a bottommost charge retaining transistor of each of the NOR flash memory circuits to a local source line associated with the on which each NOR flash memory circuit, and connecting each control gate of the charge retaining transistors on each row are commonly to a word line. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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71. An integrated circuit device comprising:
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an array of NAND flash nonvolatile memory circuits, each of the NAND flash nonvolatile memory circuit comprising; a plurality of charge retaining transistors arranged in rows and columns wherein said charge retaining transistors on each column form at least one grouping of charge retaining transistors that is arranged in a NAND series string of charge retaining transistors, each NAND series string having a top select transistor and a bottom select transistor; an array of a plurality of NOR flash nonvolatile memory circuits, wherein each of the nonvolatile memory circuits comprise; a plurality of charge retaining transistors arranged in rows and column wherein the charge retaining transistors on each column are organized into at least one grouping and each grouping of the charge retaining transistors are connected serially in a NAND string; wherein a drain of a topmost charge retaining transistor of each NOR flash memory circuit is connected to a local bit line associated with the column on which each NOR flash memory circuit resides; wherein a source of a bottommost charge retaining transistor of each of the NOR flash memory circuits is connected to a local source line associated with the on which each NOR flash memory circuit; and wherein each control gate of the charge retaining transistors on each row are commonly connected to a word line. - View Dependent Claims (72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95)
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Specification