Patent ID: 7071765

Claim:
A boost clock generation circuit which generates first and second boost clock signals used to control two switching elements connected in series between two power source lines in a charge-pump circuit, the boost clock generation circuit comprising: a first switch circuit connected between a first power supply line to which a first power supply voltage is supplied and a first clock output line to which the first boost clock signal is output; a second switch circuit connected between a second power supply line to which a second power supply voltage is supplied and the first clock output line; a third switch circuit connected between a third power supply line to which a third power supply voltage is supplied and a second clock output line to which the second boost clock signal is output; and a fourth switch circuit connected between a fourth power supply line to which a fourth power supply voltage is supplied and the second clock output line, wherein the first and second switch circuits are ON/OFF controlled based on a first clock signal so that one of the first and second switch circuits is exclusively turned ON; wherein the third and fourth switch circuits are ON/OFF controlled based on a second clock signal so that one of the third and fourth switch circuits is exclusively turned ON; wherein a current drive capability to drive an output of the first switch circuit in an ON state differs from current drive capability to drive an output of the third switch circuit in an ON state; and wherein a current drive capability to drive an output of the second switch circuit in an ON state differs from a current drive capability to drive an output of the fourth switch circuit in an ON state.