Patent ID: 7233193

Claim:
A high voltage switching circuit of a NAND type flash memory device, the high voltage switching circuit comprising: a clock level shifter for increasing an amplitude of a clock signal, wherein the clock level shifter comprises: precharging means connected to a power source voltage terminal and configured to precharge first and second nodes; a first capacitor connected between the first node and an input terminal of the clock signal, for increasing a voltage of the first node in response to the clock signal; a second capacitor connected between the second node and an input terminal of an inversed clock signal, for increasing a voltage of the second node in response to the inversed clock signal; a first switching element connected between the first node and a first output terminal, for transferring an increased voltage of the first node to the first output terminal; a second switching element connected between the second node and a second output terminal, for transferring an increased voltage of the second node to the second output terminal; a first discharging element for discharging the first output terminal in response to the inversed clock signal; and a second discharging element for discharging the second output terminal in response to the clock signal; a pass voltage generator for outputting a pass voltage by pumping an external high voltage(Vpp) in response to a clock signal with an increased amplitude; and a high voltage pass transistor for transferring an input high voltage(HVIN) according to the pass voltage.