Device Flash (Kbytes) Pin Count Max. Operating Frequency CPU # of Touch Channels Max I/O Pins Ext Interrupts SPI TWI (I2C) UART ADC Channels ADC Resolution (bits) ADC Speed (ksps) Analog Comparators SRAM (Kbytes) EEPROM (Bytes) Self Program Memory Temp. Range (deg C) I/O Supply Class (V) Operating Voltage (Vcc) Timers Output Compare Channels Input Capture Channels PWM Channels 32kHz RTC Calibrated RC Oscillator Green Packages ATmega8 8 32 16 8-bit AVR 12 23 2 1 1 1 8 10 15 1 1 512 yes -40 to 85 2.7 to 5.5 2.7 to 5.5 3 3 1 3 yes yes  MLF (VQFN) 32 TQFP 32 PDIP 28 ATmega88 8 32 20 8-bit AVR 12 23 24 2 1 1 8 10 15 1 1 512 yes -40 to 85 1.8 to 5.5 1.8 to 5.5 3 6 1 6 yes yes  MLF (VQFN) 32 TQFP 32 PDIP 28