The LTC 1334 is a low power CMOS bidirectional transceiver featuring two reconfigurable interface ports. It can be configured as two RS485 differential ports, as two dual RS232 single-ended ports or as one RS485 differential port and one dual RS232 single-ended port. An onboard charge pump requires four 0.1F capacitors to generate boosted positive and negative supplies, allowing the RS232 drivers to meet the RS232 5V output swing requirement with only a single 5V supply. A shutdown mode reduces the ICC supply current to 10A.