The Cypress CY7C65620-56LTXC is a 2-port USB 2.0 hub controller from the EZ-USB HX2LP series, packaged in a 56-VFQFN with exposed pad (8x8 mm). It handles the full USB 2.0 hub protocol — upstream port enumeration, downstream port connect/disconnect, and transaction translation — so the host sees a single device while the hub serves two downstream ports. The 3.15 V to 3.45 V supply rail is tighter than a typical 3.3 V ±10% LDO output; the board's power tree needs a regulator that holds within that window across load and temperature.
It belongs inside an office peripheral, a consumer appliance, or an indoor test fixture — not in a motor-drive cabinet, an automotive cabin, or an outdoor enclosure.
Package and footprint reality
The pad is the main thermal path — without a solid via stitch to the ground plane, junction temperature climbs quickly if the hub is driving both ports at high current. The QFN lands on a 0.5 mm pitch; the PCB layout engineer should bring the decoupling caps inside a 5 mm radius of the supply pins.