SIT202 is a 5V-power-supply, dual-channel, low-power RS-232 transceiver that fully meets the requirements of the TIA/EIA-232 standard. The SIT202 includes two drives and two receivers, all of which can be used independently. Receiver converts RS-232 signal to CMOS logic output level. EIA/TIA-232E defines a voltage greater than 3V as logic 0, SIT232 all receivers are reversed, so the TTL responding level of the receiver is consistent with the EIA/TIA-232E level. Powered by 5V power supply, The charge pump requires only four 1uF external capacitance to work at a rate of at least 120kbps error-free data transmission, both of which can be independently enabled and closed. Each driver and receiver can be used independently.