RS-485 bus interface in a 5V system
It operates from a 4.75V to 5.25V supply and includes 50 mV of receiver hysteresis for noise rejection on differential buses.
Supply rail and logic-level fit
This part is a 5V-only device. The supply range is tight — 4.75V to 5.25V — so a regulated 5V rail is required. It is not rated for 3.3V operation on the bus or logic side; interfacing with a 3.3V microcontroller needs level translation on the driver/receiver enable and data pins.