The TUSB7320 supports up to two downstream ports. The TUSB7340 is a USB 3.0 xHCI compliant host controller that supports up to four downstream ports. Both parts are available in a pin-compatible ...
Cypress offers a complete development kit for developing a fixed-function, very low-power Multi-TT 4-port USB 2.0 hub controller (48 TQFP package) that is production ready and USB-IF compliant.