Block selection circuit controlling series connected pass transistors and flash memory including the same

A flash memory comprising:

• a memory block connected to a plurality of word lines;
• an address decoder configured to select the memory block using a block address;
• a first pass transistor connected to the address decoder;
• a second pass transistor connected in series with the first pass transistor and connected to a word line among the plurality of word lines;
• a first driver circuit configured to control a gate voltage of the first pass transistor based on a first enable signal;
• a second driver circuit configured to control a gate voltage of the second pass transistor based on a second enable signal;
• a first switch circuit configured to selectively provide a first power voltage or a second power voltage to a gate of the first pass transistor through the first driver circuit based on a first switch signal;
• and
• a second switch circuit configured to selectively provide the first power voltage or the second power voltage to a gate of the second pass transistor through the second driver circuit based on a second switch signal,
• wherein the first switch circuit is used individually for the memory block, and
• wherein the second switch circuit is shared by the memory block and other memory blocks.

A block selection circuit of a flash memory, the block selection circuit comprising:

• a first pass transistor connected to an address decoder;
• a second pass transistor connected in series with the first pass transistor;
• a first driver circuit configured to control a gate voltage of the first pass transistor based on a first enable signal;
• and
• a second driver circuit configured to control a gate voltage of the second pass transistor based on a second enable signal,
• wherein, based on a memory block connected to the second pass transistor during an erase operation being an unselected memory block, the first driver circuit controls the first pass transistor to be in a floating state, and the second driver circuit controls a power voltage to be provided to a gate of the second pass transistor.