The ST232BDR is a full duplex RS-232 transceiver from STMicroelectronics. It features 2 drivers and 2 receivers and operates from a single +5V power supply.
The ST232BD from STMicroelectronics is a full duplex RS232 transceiver designed for surface mount applications. It operates within a voltage range of 4.5V to 5.5V and features a data rate of 220Kbps.