MaxLinear's dual protocol transceivers with integrated termination address each of these common pitfalls in a convenient single chip package. All switches and termination resistors are integrated, resulting in a much smaller board footprint than a discrete implementation. The on-board charge pump generates the RS-232 bipolar voltage levels from a single 3.3V or 5V supply with only four external capacitors, and does not require any inductors or magnetic components. Both SP338 and SP339 provide three RS-232 drivers and five receivers to support all eight signals required for the DB9 serial port. The RS-485 and 422 modes include both full and half duplex configurations.