Invention Grant
- Patent Title: Countermeasure for reducing peak current during programming by optimizing timing of latch scan operations
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Application No.: US17188998Application Date: 2021-03-01
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Publication No.: US11361835B1Publication Date: 2022-06-14
- Inventor: Yu-Chung Lien , Fanglin Zhang , Huai-Yuan Tseng
- 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: G11C16/10
- IPC: G11C16/10 ; G11C16/34 ; G11C16/08 ; G11C16/30 ; G11C16/26

Abstract:
Apparatuses and techniques are described for avoiding current consumption peaks during a program operation for a memory device. The timing of scan operations of latches is adjusted to avoid overlapping with an increase in word line voltages. The scan operations can include a pre-charge select scan, which identifies memory cells subject to a verify test, and a fill operation for latches of memory cells which fail a verify test in a prior program loop. The pre-charge select scan can occur before the increase in the word line voltages, while the fill operation occurs after the increase in word line voltages. In another approach, the start of the increase in the word line voltages is delayed when a state bit scan is expected to take a relatively long time, e.g., when a verify test is passed in a prior program loop.
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