Invention Grant
US07974136B2 Method for erasing a flash memory cell or an array of such cells having improved erase coupling ratio
有权
擦除具有改善的擦除耦合比的这种单元的闪存单元或阵列的方法
- Patent Title: Method for erasing a flash memory cell or an array of such cells having improved erase coupling ratio
- Patent Title (中): 擦除具有改善的擦除耦合比的这种单元的闪存单元或阵列的方法
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Application No.: US12645337Application Date: 2009-12-22
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Publication No.: US07974136B2Publication Date: 2011-07-05
- Inventor: Geeng-Chuan Michael Chern , Ben Sheen , Jonathan Pabustan , Der-Tsyr Fan , Yaw Wen Hu , Prateep Tuntasood
- Applicant: Geeng-Chuan Michael Chern , Ben Sheen , Jonathan Pabustan , Der-Tsyr Fan , Yaw Wen Hu , Prateep Tuntasood
- Applicant Address: US CA Sunnyvale
- Assignee: Silicon Storage Technology, Inc.
- Current Assignee: Silicon Storage Technology, Inc.
- Current Assignee Address: US CA Sunnyvale
- Agency: DLA Piper LLP (US)
- Main IPC: G11C16/04
- IPC: G11C16/04

Abstract:
A flash memory cell is of the type having a substrate of a first conductivity type having a first region of a second conductivity type at a first end, and a second region of the second conductivity type at a second end, spaced apart from the first end, with a channel region between the first end and the second end. The flash memory cell has a plurality of stacked pairs of floating gates and control gates with the floating gates positioned over portions of the channel region and are insulated therefrom, and each control gate over a floating gate and insulated therefrom. The flash memory cell further has a plurality of erase gates over the channel region which are insulated therefrom, with an erase gate between each pair of stacked pair of floating gate and control gate. In a method of erasing the flash memory cell, a pulse of a first positive voltage is applied to alternating erase gates (“first alternating gates”). In addition, a ground voltage is applied to erase gates other than the first alternating gates (“second alternating gates”). In a second method to erase the flash memory cell, a pulse of a first positive voltage is applied to the first alternating gates and a negative voltage is applied to the second alternating gates and to all control gates.
Public/Granted literature
- US20100157687A1 Method for Erasing a Flash Memory Cell or an Array of Such Cells Having Improved Erase Coupling Ratio Public/Granted day:2010-06-24
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