ATtiny13 - 1K flash, 64 bytes of ram, 64 bytes of EEPROM ATtiny25 - 2K flash, 128 bytes of ram, 128 bytes of EEPROM ATtiny85 - 8K flash, 512 bytes of ram, 512 bytes of EEPROMThey all have an 8 bit counter-timer so you don't have any fancier PWM options with any of the other chips. You can find the ATtiny85 chips on Digikey for $1.50, so why not?
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