hello,
i found a project example using a PIC16F (with I²C link) and a Philips (PDIUSBD11) USB chip, available in DIP package (not SMD) ;D
here are the links :
Article : http://www.beyondlogic.org/usbnutshell/usb7.htm#PIC16F876Example
USB chip info : http://www.semiconductors.philips.com/buses/usb/products/device/pdiusbd11/
may it help ?
RAF