I think the Attiny devices | Microcontroller › AVR › Inter-microcontroller interrupt service › I think the Attiny devices January 15, 2014 at 7:45 am #10853 AJISH ALFREDParticipant I think the Attiny devices can be operated in 3V only. Would suggest you to go through the datasheet of your particular microcontroller and confirm it yourself. It must be there in the ‘maximum ratings’ inside the datasheet
