The MAX489CSD+ is a single-channel, full-duplex RS-422/RS-485 transceiver from Analog Devices (formerly Maxim Integrated). The supply range is 4.75 V to 5.25 V, so it runs on a 5 V nominal rail—not 3.3 V.
Data rate of 250 kbps is the practical ceiling for this transceiver. At that speed, the rise/fall times are slew-limited, which keeps radiated emissions low—useful for passing FCC/CE without extra filtering. If your bus runs at 115.2 kbps or below, this part has comfortable margin. In a typical RS-485 network with 100 m of twisted pair, that hysteresis prevents chatter from ground shifts and reflections. Supply voltage is strictly 5 V ±5%. Do not try 3.3 V—the part is not specified there. Verify your rail is within 4.75 V to 5.25 V, especially if the board has a 5 V LDO with dropout headroom issues. Not rated for -40°C or +85°C, so skip it for outdoor telecom or under-hood automotive.
It remains a standard catalog item through Analog Devices' distribution network.