Invention Grant
- Patent Title: Semiconductor memory device and memory system
-
Application No.: US15694969Application Date: 2017-09-04
-
Publication No.: US10109355B2Publication Date: 2018-10-23
- Inventor: Osamu Nagao
- Applicant: Toshiba Memory Corporation
- Applicant Address: JP Tokyo
- Assignee: TOSHIBA MEMORY CORPORATION
- Current Assignee: TOSHIBA MEMORY CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Patterson & Sheridan, LLP
- Priority: JP2017-042499 20170307
- Main IPC: G11C8/00
- IPC: G11C8/00 ; G11C16/12 ; G11C16/04 ; G11C11/56 ; G11C16/34 ; H01L27/115 ; G11C16/08 ; G11C16/26

Abstract:
A semiconductor memory device includes a memory cell array having a plurality of memory cell groups, the memory cell groups including a first memory group including first memory cells, and a control circuit configured to execute a first write operation targeting the first memory cells in a first mode in which the control circuit executes at least a first programming operation on the first memory cells followed by a multiple number of first verification operations to verify the first programming operation, and then in a second mode, in which the control circuit executes a second programming operation on the first memory cells followed by a second verification operation to verify the second programming operation. A programming voltage applied during the second programming operation is less than a programming voltage applied during the first programming operation, and is adjusted based on a number of first verification operations.
Public/Granted literature
- US20180261291A1 SEMICONDUCTOR MEMORY DEVICE AND MEMORY SYSTEM Public/Granted day:2018-09-13
Information query