The 35 mV of receiver hysteresis helps reject noise on long cable runs.
That means TI has scheduled the end of production — the window to place final orders is closing. If this part is on your BOM, you need to secure lifetime buy quantities now or qualify a drop-in replacement before supply dries up.
3.3 V RS485 — the supply and signal story
The RS485 bus pins are 5 V tolerant, so it can coexist on a bus with 5 V transceivers as long as the common-mode range is respected. The half-duplex architecture means a single twisted pair handles both transmit and receive, switched by the driver enable pin.