The maximum cable length supported by the CY7C65621-56LTXC is 3 meters (10 feet) for USB 2.0 and 1 meter (3.3 feet) for USB 3.0.
Yes, the CY7C65621-56LTXC can be used in a USB 3.0-only application, but it will not take advantage of the USB 2.0 functionality.
The CY7C65621-56LTXC has a built-in USB 2.0 and USB 3.0 coexistence mechanism that allows it to dynamically switch between the two modes based on the connected device and the system configuration.
The power consumption of the CY7C65621-56LTXC is typically around 350 mA for USB 3.0 operation and 150 mA for USB 2.0 operation.
No, the CY7C65621-56LTXC does not support USB OTG functionality.