The 2 Mbps data rate is the practical ceiling for CAN FD in many designs; it allows higher throughput than the classical 1 Mbps CAN limit, which matters when firmware updates or sensor data streams need more bus bandwidth. The single driver/receiver pair (1/1) is the standard node configuration; if your design needs a second CAN channel, you would add another transceiver rather than look for a dual-channel variant in this family.
The -55°C low end also covers cold-soak conditions for outdoor telecom and avionics auxiliary systems. The 4.5V minimum supply ensures the transceiver stays operational during a 5V rail brown-out down to 4.5V, which is a common requirement for 12V/24V battery systems with cranking dips.