Macronix International Co., Ltd.

Shih-Lin Huang

Shuo-Nan Hung

Chun-Hsiung Hung

Hang-Ting Lue

Kuo-Pin Chang

Chih-Chang Hsieh

Ji-Yu Hung

Ti Wen Chen

Ti-Wen Chen

Fu-Tsang Wang

A memory circuit includes word lines coupled to a memory array, including a first set of one or more word lines deselected in an erase operation, and a second set of one or more word lines selected in the erase operation. Control circuitry couples the first set of one or more word lines deselected in the erase operation to a reference voltage, responsive to receiving an erase command for the erase operation. Some examples further include a first transistor that switchably couples a word line to a global word line, and a second transistor that switchably couples the word line to a ground voltage. The control circuitry is coupled to the first transistor and the second transistor, wherein the control circuitry has a plurality of modes including at least an erase operation. In a first mode, the first transistor couples the word line to the global word line, and the second transistor decouples the word line from the ground voltage. In a second mode, the first transistor decouples the word line from the global word line, and the second transistor couples the word line to the ground voltage.

Word line driver circuit for selecting and deselecting word lines

A charge storage memory is configured in a NAND array, and includes NAND strings coupled to bit lines via string select switches and includes word lines. A controller is configured to produce a bias for performing an operation on a selected cell of the NAND array. The bias includes charging the bit line while the string select switches are closed, such as to not introduce noise into the strings caused by such bit line charging. The semiconductor body regions in memory cells that are on both sides of the memory cells in the NAND strings that are coupled to a selected word line are coupled to reference voltages such that they are pre-charged while the word lines of the strings in the array are transitioned to various voltages during the operation.

NAND flash biasing operation

Techniques are described herein for compensating for threshold voltage variations among memory cells in an array by applying different bias conditions to selected bit lines. Techniques are also described herein for connecting global bit lines to a variety of levels of memory cells in a 3D array, to provide for minimizing capacitance differences among the global bit lines.

Architecture for a 3D memory array

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Penghu, Taiwan

Shih-Lin Huang