A charge pump includes boosting circuits cascade coupled between first and second nodes, wherein each boosting circuit is operable in both a positive voltage boosting mode to positively boost voltage and a negative voltage boosting mode to negatively boost voltage. A first switching circuit selectively applies a first voltage to one of the cascaded boosting circuits in response to a first logic state of a periodic enable signal, with the cascaded boosting circuits operating in the positive voltage boosting mode to produce a high positive voltage at the second node. A second switching circuit selectively applies a second voltage to another of the cascaded boosting circuits in response to a second logic state of the periodic enable signal, with the cascaded boosting circuits operating in the negative voltage boosting mode to produce a high negative voltage at the first node. Simultaneous output of the positive and negative voltages is made.