High-voltage switch circuit

A high-voltage switch circuit, comprising:

• at least one voltage source input terminal for providing at least one voltage source;
• a passing circuit configured to controllably pass said at least one voltage source;
• a multi-stage cascade pumping circuit configured to raise voltage level of one output terminal thereof by at least a pair of clock signals inputting to the multi-stage cascade pumping circuit;
• at least one switch circuit under control of a switch signal so that the voltage source controllably propagates to one output terminal of the switch circuit through the passing circuit, wherein the output terminal of the switch circuit is coupled to a word line or a source line of a flash memory device;
• and
• an equalizing circuit configured to force the output terminal of the multi-stage cascade pumping circuit and one internal node of the multi-stage cascade pumping circuit to an equal potential, so that the voltage source propagates to the output terminal of the switch circuit through the equalizing circuit when the output terminal of the switch circuit is coupled to a ground.