The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2022
Filed:
Jan. 27, 2021
Yangtze Memory Technologies Co., Ltd., Hubei, CN;
Qiang Tang, Hubei, CN;
Li Wei Wang, Hubei, CN;
Yangtze Memory Technologies Co., Ltd., Hubei, CN;
Abstract
Methods for erasing storage data of a three-dimensional (3D) memory device are presented. The 3D memory device includes a plurality of memory blocks, each memory block having a plurality of memory strings with vertically stacked memory cells. Each memory cell is addressable through a word line and a bit line. The storage data in a selected memory block can be erased by applying an erase voltage on an array common source and applying a first voltage on the word lines of the selected memory block. Word lines of an unselected memory block are floating, i.e., without external bias, during the erasing operation. After the erasing operation, a second voltage is applied on the word lines of entire memory plane to reset the memory cells for improved data retention.