Atmega328P-AU

• MCU, 8BIT, AVR, 32K FLASH, 32TQFP
•  Controller Family/Series: AVR MEGA
•  Core Size: 8bit
•  No. of I/O’s: 23
•  Supply Voltage Min: 1.8V
•  Supply Voltage Max: 5.5V
•  Digital IC Case Style: TQFP
•  No. of Pins: 32
•  Program Memory Size: 32KB
•  EEPROM Memory Size: 1KB
•  RAM Memory Size: 2KB
•  CPU Speed: 20MHz
•  Peripherals: ACMP, ADC, POR, PWM, RTC
•  Embedded Interface Type: I2C, SPI, USART
•  Operating Temperature Min: -40°C
•  Operating Temperature Max: 85°C
•  SVHC: No SVHC (19-Dec-2012)
•  No. of PWM Channels: 6
•  No. of Timers: 3
•  Operating Temperature Range: -40°C to +85°C
•  Oscillator Type: External, Internal

http://www.atmel.com/Images/Atmel-8271-8-bit-AVR-Microcontroller-ATmega48A-48PA-88A-88PA-168A-168PA-328-328P_datasheet.pdf