Specification :

The super-cool 18F4550 from Microchip offers full speed USB 2.0. The chip has 16K of on board flash memory and runs at an amazing 12MIPS with a 4MHz external crystal. Using the internal PLL it can get up to 96Mhz! ! ! Fantastic value for the price. Can also be programmed in circuit. Features

Full Speed USB 2.0 ( 12Mbit/ s) interface
1K byte Dual Port RAM + 1K byte GP RAM
Full Speed Transceiver
16 Endpoints ( IN/ OUT)
Streaming Port
Internal Pull Up resistors ( D+ / D-)
48 MHz performance ( 12 MIPS)
Pin-to-pin compatible with PIC16C7X5