The ADM232A have two drives and two receivers. The drivers and receivers meet all EIA/TIA-232E  and CCITT V.28 specifications at data rates up to 120 kbps when loaded in accordance with the EIA/ TIA-232E specification.

The ST232 have two drives and two receivers. The drivers and receivers meet all EIA/TIA-232E and CCITT V.28 specifications at data rates up to 120 kbps when loaded in accordance with the EIA/TIA- 232E specification.

The SP3232EEN has two receivers and two drivers,  and a dual charge-pump circuit. The device meets the  requirements of TIA/EIA-232-F and provides the electrical  interface between an asynchronous communication controller and  the serial-port connector. The charge pump and four small external  capacitors allow operation from a single 3.0V to 5.5V supply.  The device operates at data signaling rates up to 250kbit/s and a  maximum of 35V/μs driver output slew rate.

The SP232E have two drives and two receivers. The drivers and receivers meet all EIA/TIA-232E and  CCITT V.28 specifications at data rates up to 120 kbps when loaded in accordance with the EIA/TIA- 232E specification.