Non-volatile semiconductor memory device and improved verification and programming method for the same
Provided herein are semiconductor memory devices and operating methods thereof. A semiconductor memory device may include a memory cell array including a plurality of cell strings, and a peripheral circuit. The peripheral circuit may include a voltage generating unit configured to perform a program loop for alternately performing a program operation and a verification operation on the memory cell array. The peripheral circuit may include a control logic configured to control the voltage generating unit to perform the program loop. Wherein, in performing the program loop, a second pass voltage applied to an unselected word line adjacent to a selected word line among a plurality of word lines connected with the memory cell array is lower than a first pass voltage applied to a remaining unselected word line during the program operation.
1. A semiconductor memory device, comprising:
a memory cell array including a plurality of cell strings;
a peripheral circuit comprising:
a voltage generating unit configured to perform a program loop for alternately performing a program operation and a verification operation on the memory cell array; and
a control logic configured to control the voltage generating unit to perform the program loop,
wherein, in performing the program loop, a second pass voltage applied to an unselected word line adjacent to a selected word line among a plurality of word lines connected with the memory cell array is lower than a first pass voltage applied to a remaining unselected word line during the program operation, and
wherein the control logic controls the peripheral circuit unit so that the first pass voltage is changed to the second pass voltage and the second pass voltage is applied to the adjacent unselected word line in a section in which the verification operation is switched to the program operation in the program loop.
2. The semiconductor memory device of claim 1 , wherein the control logic controls the voltage generation unit to turn off a drain selection transistor and a source selection transistor included in an unselected cell string among the plurality of cell strings while the program loop is performed.
3. The semiconductor memory device of claim 1 , wherein the control logic controls the peripheral circuit unit so that the first pass voltage and the second pass voltage are continuously applied in the section.
4. The semiconductor memory device of claim 1 , wherein the control logic controls the peripheral circuit unit to continuously apply the first pass voltage to the remaining unselected word line while the verification operation is switched to the program operation in the program loop.
5. The semiconductor memory device of claim 1 , wherein the control logic controls the peripheral circuit unit so that the second pass voltage is changed to the first pass voltage and the first pass voltage is applied to the adjacent unselected word line in a section, in which the program operation is switched to the verification operation in the program loop, in such a manner that the second pass voltage and the first pass voltage are continuously applied.
6. The semiconductor memory device of claim 1 , wherein the control logic controls the peripheral circuit unit to continuously apply the first pass voltage to the remaining unselected word line while the program operation is switched to the verification operation in the program loop.
7. The semiconductor memory device of claim 1 , wherein the control logic controls the peripheral circuit unit so that a verification voltage is applied to the selected word line during the verification operation and a program voltage is applied to the selected word line during the program operation, in such a manner that a section, in which the selected word line is discharged, is included in a section between the operation of applying the verification voltage and the operation of applying the program voltage.
8. The semiconductor memory device of claim 1 , wherein the control logic controls the peripheral circuit unit so that a verification voltage is applied to the selected word line during the verification operation and a program voltage is applied to the selected word line during the program operation, in such a manner that the operation of applying the verification voltage and the operation of applying the program voltage are continuously performed.