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ATmega328 - TQFP
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Price: $7.18
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Sparkfun Item #: COM-13448 -

"This is Atmel’s high performance, low power 8-bit AVR ATMega328 microcontroller in a pint-sized TQFP package. Yes, you really can solder that. Note: There is no difference between this part and its previous version. This new copy was created to help make our in house assemblies easier to produce and manage. Features: 1.8-5.5V operating range Up to 20MHz Part: ATMEGA328P-AU 32kB Flash program memory 1kB EEPROM 2kB Internal SRAM 2 8-bit Timer/Counters 1 16-bit Timer/Counter RTC with...

AVR 14 Pin 20MHz 8K 12A/D - ATtiny84
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Price: $4.98
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Sparkfun Item #: COM-11232 -

"The ATtiny84 is another of Atmel’s little tiny 8-Bit Processors. 8K of program space, 12 I/O lines, and 8-channel 10 bit ADC. It will run up to 20MHz with an external crystal and can be programmed in circuit. Documents: Datasheet Product Card ATtiny Arduino Cores " ...

AVR 28 Pin 20MHz 32K 6A/D - ATMega328P
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Price: $7.39
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Sparkfun Item #: COM-09061 -

"Atmel’s ATMega328P 8-Bit Processor in 28 pin DIP package. It’s like the ATmega168, with double the flash space. 32K of program space. 23 I/O lines, 6 of which are channels for the 10-bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. 1.8V to 5V operating voltage! Documents: Datasheet Low Power Mode Tutorial " ...

AVR 8 Pin 20MHz 8K 4A/D - ATtiny85
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Price: $4.80
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Sparkfun Item #: COM-09378 -

"Atmel’s itty-bitty ATtiny85 8-Bit Processor. 8K of program space, 6 I/O lines, and 4-channel 10 bit ADC. Runs up to 20MHz with external crystal. Package can be programmed in circuit. Documents: Product Card Arduino Quick Reference "