THVD4431 is a highly integrated and robust multiprotocol transceiver supporting RS-232, RS-422 and RS-485 physical layers. The device has three transmitters and five receivers to enable 3T5R RS-232 port. Device also integrates one transmitter and one receiver to enable half and full duplex RS-485 port. MODE selection pins enable shared bus and logic pins for the protocols to share a common single connector. Integrated termination for RS-485 bus pins and for RS-232 receiver inputs verify no external components are needed to realize a fully functional communication port. These devices have a slew rate select feature that enables the devices to be used at two maximum speeds based on the SLR pin setting.

These devices feature integrated Level 4 IEC ESD protection, eliminating the need for external system level protection components. Diagnostic loopback mode for both RS-232 and RS-485 is provided to check for logic to bus and bus to logic path functional integrity and check for cable and connector shorts. In addition, the RS-485 receiver fail-safe feature drives logic high on received logic output when the bus inputs are open or shorted together or when the bus is idle. Shutdown mode consumes ultra-low current (10 uA typical), which is an excellent choice for power-sensitive applications. The device needs 3 to 5.5 V supply that powers the charge pump for RS-232 and the drivers/receivers for both RS-232 and RS-485. A separate logic supply VIO (1.65 V to 5.5 V) enables interface with low level microcontrollers.

For more specific device information please see data sheet (SLLSFS1).