Invention Grant
- Patent Title: Erase for 3D non-volatile memory with sequential selection of word lines
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Application No.: US13960360Application Date: 2013-08-06
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Publication No.: US08908444B2Publication Date: 2014-12-09
- Inventor: Xiying Costa , Seung Yu , Roy E. Scheuerlein , Haibo Li , Man L. Mui
- Applicant: SanDisk Technologies Inc.
- Applicant Address: US TX Plano
- Assignee: SanDisk Technologies Inc.
- Current Assignee: SanDisk Technologies Inc.
- Current Assignee Address: US TX Plano
- Agency: Vierra Magen Marcus LLP
- Main IPC: G11C16/00
- IPC: G11C16/00 ; G11C16/16 ; G11C16/14 ; G11C16/24 ; G11C11/56 ; G11C16/34 ; H01L29/792 ; H01L27/115

Abstract:
An erase operation for a 3D stacked memory device adjusts a start time of an erase period and/or a duration of the erase period for each storage element based on a position of the storage element. A voltage is applied to one or both drive ends of a NAND string to pre-charge a channel to a level which is sufficient to create gate-induced drain leakage at the select gate transistors. With timing based on a storage element's distance from the driven end, the control gate voltage is lowered to encourage tunneling of holes into a charge trapping layer in the erase period. The lowered control gate voltage results in a channel-to-control gate voltage which is sufficiently high to encourage tunneling. The duration of the erase period is also increased when the distance from the driven end is greater. As a result, a narrow erase distribution can be achieved.
Public/Granted literature
- US20140043916A1 Erase For 3D Non-Volatile Memory With Sequential Selection Of Word Lines Public/Granted day:2014-02-13
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