the boot node 522 b to the output node 550 the boot node 522 b begins to discharge into the output node 550 to drive the vccp signal note that the p 2 b 1 signal decreases as the boot node 522 b the p 2 a signal discharges because of the diode coupled transistors 514 b further note that the p 2 c 2 signal increases during times t 2 and t 3 because the p 2 b 2 signal which is booted by ph 2 b signal drives the gate of the transistor 544 b so that the full voltage of vcc can be applied to the node 543 b at time t 3 the ph 2 b signal goes low switching off the transistor 552 b concurrently the ph 2 c signal goes high driving the voltage on the nodes 542 b and 543 b the p 2 c 1 and p 2 c 2 signals respectively the p 2 c 2 signal switches on the transistor 523 a to couple the boot node 522 b to the boot node 522 a in order to pre charge that node with any excess charge the conservation of charge is illustrated in fig6 that is as the p 2 a signal decreasing between time.