Specification Microcontroller ATmega328Operating Voltage logiclevel 5VInput Voltage recommended 7V 12VInput Voltage limits 6V 20 VDigital I O Pins 14 of which 6 provide PWM output Analog Input Pins 8DC Current per I O Pin 40mAFlash Memory 32KB ATmega328 of which 2 KB used by bootloader SRAM 2KB ATmega328 EEPROM 1KB ATmega328 Clock Speed 16MHzChip CH340G CH340B is the update version of CH340G CH340B comes with crystal but CH340G doesn t and we default sending CH340G version Note Improved USB chip for speed and stability using WIN7 WIN8 This version comes with 15 pin headers unsoldered 6 pin headers soldered and not included the USB cable Package included 1 3 5 x Nano V3 0 Board with pins optional