ROHM datasheet for the RSS090N03 component, a 57.4 KB PDF. The N in the part code suggests an N-channel MOSFET, though the name itself gives no further detail.

Datasheet for the Texas Instruments TMS75176A, a differential bus transceiver for RS-485 and RS-422 style balanced data lines.

Datasheet for the TMS75176B, a Texas Instruments differential bus transceiver for RS-485 and RS-422 links, a variant of the widely used 75176 family.

Datasheet for the HIN232, an Intersil RS-232 transceiver with two drivers and two receivers powered from 5 V using an internal charge pump and external capacitors.

Datasheet for the MAX233, a Maxim RS-232 line driver and receiver that needs no external charge-pump capacitors, running from a single 5 V supply.

Datasheet for the Prolific PL-2303HX USB-to-serial UART bridge controller, a chip found in many USB-RS232 and USB-TTL adapters and some embedded devices.