Sub-block decoding in 3D memory
AssigneeMicron Technology, Inc.
InventorChang Wan Ha
Life of this patent
Estimating the term…
Abstract
Some embodiments relate to apparatuses and methods associated with blocks of memory cells. The blocks of memory cells may include two or more sub-blocks of memory cells. Sub-blocks may comprise a vertical string of memory cells including a source select transistor and a drain select transistor. An apparatus may include two or more drain select lines, of which a first drain select line is coupled to a drain select transistor in a first sub-block of a first block and to a drain select transistor in a first sub-block of a second block. A second drain select line in the apparatus may be coupled to a drain select transistor in a second sub-block of the first block and to a drain select transistor in a second sub-block of the second block. Other apparatuses and methods are described.
Claims25
An apparatus comprising:
- a plurality of blocks of memory cells, including a first block and a second block, wherein a block includes two or more sub-blocks, including a first sub-block and a second sub-block, a sub-block including a vertical string of memory cells including a respective plurality of memory cells, a respective source select transistor, and a respective drain select transistor;
- two or more drain select lines, including a first drain select line and a second drain select line, the first drain select line being coupled to the drain select transistor in the first sub-block of the first block and the first drain select line being coupled to the drain select transistor in the first sub-block of the second block, and the second drain select line being coupled to the drain select transistor in the second sub-block of the first block and the second drain select line being coupled to the drain select transistor in the second sub-block of the second block;
- and
- a plurality of transistors comprising select transistors and deselect transistors wherein a first select transistor and a first deselect transistor are coupled to the first drain select line and a second select transistor and a second deselect transistor are coupled to the second drain select line wherein the first select transistor is configured to couple a select bias to the first drain select line at a first time, the second select transistor is configured to couple the select bias to the second drain select line at a second time, different from the first time, the first deselect transistor is configured to couple a deselect bias to the first drain select line at the second time, and the second deselect transistor is configured to couple the deselect bias to the second drain line at the first time.
An apparatus comprising:
- a plurality of blocks of memory cells, including a first block of memory cells and a second block of memory cells;
- two or more source select lines;
- two or more drain select lines;
- a block select switch,
- each block of the plurality of blocks including two or more sub-blocks, the two or more sub-blocks including a first sub-block and a second sub-block, each sub-block including
- a vertical string of memory cells, each vertical string including a respective plurality of memory cells, a respective source select transistor and a respective drain select transistor,
- the two or more drain select lines including a first drain select line and a second drain select line, the first drain select line being coupled to the drain select transistor in the first sub-block of each block of memory cells of the plurality of blocks of memory cells and the second drain select line being coupled to the drain select transistor in the second sub-block of each block of memory cells of the plurality of blocks of memory cells;
- and
- a plurality of transistors comprising select transistors and deselect transistors wherein a first select transistor and a first deselect transistor are coupled to the first drain select line and a second select transistor and a second deselect transistor are coupled to the second drain select line wherein the first select transistor is configured to couple a select bias to the first drain select line at a first time, the second select transistor is configured to couple the select bias to the second drain select line at a second time, different from the first time, the first deselect transistor is configured to couple a deselect bias to the first drain select line at the second time, and the second deselect transistor is configured to couple the deselect bias to the second drain line at the first time.
An apparatus comprising:
- a plurality of tiers of access lines associated with two or more vertical strings of memory cells of a first memory block, a sub-block of the first memory block including a vertical string of memory cells comprising a source select transistor and a drain select transistor;
- a drain select line, coupled to the drain select transistor of the sub-block of the first memory block, the drain select line being further coupled to a drain select transistor associated with a sub-block of a second memory block, the first memory block and the second memory block comprising a group of memory blocks;
- and
- a plurality of transistors comprising a sub-block select transistor and a sub-block deselect transistor coupled to the drain select line wherein the sub-block select transistor is configured to couple a select bias to the drain select line at a first time and the sub-block deselect transistor is configured to couple a deselect bias to the drain select line at a second time, different from the first time.
A method of accessing a memory cell of a first block of memory cells in an apparatus comprising a plurality of blocks of memory cells including the first block and a second block of memory cells, the first block and the second block included in a first group of blocks, the first group of blocks having an associated first block select switch, the apparatus further comprising a first set of global access lines coupled to the first block and a second set of global access lines coupled to the second block, the apparatus further comprising a second group of blocks, the second group of blocks having an associated second block select switch, the method comprising:
- providing a first voltage to the first block select switch;
- providing a second voltage to the second block select switch;
- providing a third voltage to at least one of the first set of global access lines that are coupled to first local access lines;
- providing a fourth voltage to the second set of global access lines that are coupled to second local access lines;
- energizing, via a source select line, source select transistors of the first block of memory cells;
- and
- energizing, via a drain select line, a drain select transistor of a first sub-block of the first block to which the memory cell belongs, the drain select line further arranged to energize a drain select transistor of a corresponding first sub-block in the second block of memory cells;
- and
- energizing a deselect transistor of a second sub-block of the first block and a corresponding second sub-block of the second block substantially simultaneously with energizing the drain select transistor of the first sub-block.
Dependencies are inferred from the claim text.