Invention Grant
- Patent Title: Multi BLCS for multi-state verify and multi-level QPW
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Application No.: US16717233Application Date: 2019-12-17
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Publication No.: US10984877B1Publication Date: 2021-04-20
- Inventor: Jongyeon Kim , Hiroki Yabe , Kou Tei , Chia-Kai Chou , Ohwon Kwon
- 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: Dickinson Wright PLLC
- Agent Steven Hurles
- Main IPC: G11C16/34
- IPC: G11C16/34 ; G11C16/04 ; G11C16/26 ; G11C11/56 ; G11C16/10 ; G11C16/24

Abstract:
An apparatus and method for a multi-state verify of a memory array are provided. A sense circuit of a memory device is connected to a bit line of the memory array. The sense circuit includes a first voltage clamp, a second voltage clamp, and a program data latch disposed on the bit line. The first and second voltage clamps are biased to first and second voltages, respectively, where the first voltage is lower than the second voltage. When a high bias is applied to the program data latch, the program data latch is in an OFF state, and the first voltage clamp limits the bias on the bit line to the first voltage. When a low bias is applied to the program data latch, the program data latch is in an ON state, and the second voltage clamp limits the bias on the bit line to the second voltage.
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