The C8051F2xx Small Form Factor Microcontrollers (MCUs) is a family of fully integrated, mixed signal System on a Chip (SoC) in a 7 x 7 mm QFP package., Up to 25 MIPS. 8 kB Flash. 256 bytes internal RAM. Four 5 V tolerant digital I/O. 2.7 to 3.6 V supply.