The PIC16F870-E/SO from MICROCHIP TECH. is PIC 16F family 28-Pin SOIC 8-Bit CMOS flash microcontroller. The PIC16F870-E/SO microcontroller has 3.5KB (2K x 14) FLASH program memory, 64 x 8 EEPROM data memory, 128 x 8 RAM size, 22 I/O general-purpose I/O pins and 5-channel 10-bit analog-to-digital (A/D) converter. This microcontroller operates at a maximum frequency of 20MHz with operating voltage of 4 to 5.5V. Operating temperature range is from -40°C to 125°C.