The USB3318-CP is a USB 2.0 ULPI transceiver from Microchip's flexPWR™ series, handling the physical-layer interface between a host or device controller and the USB bus.
Supply voltage and I/O compatibility
The 1.8V to 3.6V supply range means this transceiver mates with 1.8V, 2.5V, or 3.3V logic families without external translation. If your host processor runs its ULPI port at 1.8V, the USB3318-CP accepts that rail directly — no extra regulator or level shifter needed.
The 24-QFN (4x4 mm) with exposed pad requires a solder-paste stencil aperture that covers at least 50% of the pad area for reliable solder joint formation. The centre pad must be connected to the PCB ground plane with multiple vias to dissipate heat from the transceiver's internal PHY.