Invention Grant
- Patent Title: Suppressing program disturb during program recovery in memory device
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Application No.: US16408975Application Date: 2019-05-10
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Publication No.: US10762973B1Publication Date: 2020-09-01
- Inventor: Ching-Huang Lu , Zhengyi Zhang
- Applicant: SanDisk Technologies LLC
- Applicant Address: US TX Addison
- Assignee: SanDisk Technologies LLC
- Current Assignee: SanDisk Technologies LLC
- Current Assignee Address: US TX Addison
- Agency: Vierra Magen Marcus LLP
- Main IPC: G11C16/34
- IPC: G11C16/34 ; G11C16/24 ; G11C16/16 ; G11C16/08

Abstract:
Program disturb is suppressed during a program recovery phase of a program operation in a memory device. The duration of the recovery phase can be increased when the risk of program disturb is greater due to factors such as temperature, the position of the selected word line, the number of program-erase cycles and the program pulse magnitude. In other approaches, the risk of program disturb is reduced by providing an early ramp down of the voltages of the drain-side word line relative to a ramp down of the voltages of the source-side word lines, providing an early ramp down of the bit line voltage of the inhibited NAND strings relative to the ramp down of the select gate voltage or setting a lower recovery voltage for the source-side word lines relative to the recovery voltage of the drain-side word lines.
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