Features:

• 100% Brand new.
• This is the new MEGA2560 R3. In addition to all the features of the previous board, the MEGA now uses an ATMega16U2 instead of the ATMega8U2 chip. This allows for faster transfer rates and more memory. No drivers needed for Linux or Mac (inf file for Windows is needed and included in the Arduino IDE), and the ability to have the Uno show up as a keyboard, mouse, joystick, etc.
• The MEGA2560 R3 also adds SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin. One is the IOREF that allow the shields to adapt to the voltage provided from the board. The other is a not connected and is reserved for future purposes. The MEGA2560 R3 works with all existing shields but can adapt to new shields which use these additional pins.
• The Mega 2560 is a microcontroller board based on the ATmega2560 (datasheet). It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. The Mega is compatible with most shields designed for the Duemilanove or Diecimila.
• The Mega 2560 is an update to the Mega, which it replaces.
• The Mega2560 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the ATmega16U2 (ATmega8U2 in the revision 1 and revision 2 boards) programmed as a USB-to-serial converter.
• Revision 2 of the Mega2560 board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.
• Revision 3 of the board has the following new features:
• 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
• Stronger RESET circuit.
• Atmega 16U2 replace the 8U2.
• Schematic, Reference Design & Pin Mapping.

Specifications:

• Microcontroller: ATmega2560.
• Operating Voltage: 5V.
• Input Voltage (recommended): 7-12V.
• Input Voltage (limits): 6-20V.
• Digital I/O Pins: 54 (of which 15 provide PWM output).
• Analog Input Pins: 16.
• DC Current per I/O Pin: 40 mA.
• DC Current for 3.3V Pin: 50 mA.
• Flash Memory: 256 KB of which 8 KB used by bootloader.
• SRAM: 8 KB.
• EEPROM:4 KB.
• Clock Speed:16MHz.
• Size: 11*5.5cm/4.33"*2.17".
• USB Cable Length: approx.53cm/20.87".

Package list:

• 1 x ATmega2560-16AU Board
• 1 x USB Cable