Abstract: A NAND flash memory device having memory cells for storing data includes a fuse circuit configured to store option information for operation of the NAND flash memory device as logic codes. A register circuit includes registers for temporarily storing the logic codes stored in the fuse circuit. A test circuit is configured to change the logic code stored in the register circuit and store the changed logic code irrespective of the logic code of the fuse circuit for test operation of the NAND flash memory device. A processor is configured to control operation of the NAND flash memory device.

Abstract: A voltage conversion circuit includes a reference voltage generation unit for generating a reference voltage having a uniform level regardless of a level of an input voltage varying according to an operation mode; and a driver unit for generating and outputting an active voltage or a standby voltage using the reference voltage output by the reference voltage generation unit according to a control signal.

Abstract: A non-volatile memory device comprises an even bit line and an odd bit line contacting to a memory cell array. A register unit includes a first register and a second register for temporarily storing data. A detecting node detects a voltage level of the specific bit line or the specific register which is connected to the bit lines and the registers. A selecting unit of the bit line includes a first power input terminal and a second power input terminal. The first power input terminal applies a first power of a specific voltage level to the even bit line in response to an even discharge signal. The second power input terminal applies a second power of a specific voltage level to the odd bit line in response to an odd discharge signal.