ATtiny microcontrollers specifically exclude various common features, such as: USB peripheral, DMA controller, crypto engine, or an external memory bus.
The following table summarizes common features of the ATtiny microcontrollers, for easy comparison. This table is not meant to be an unabridged feature list.
The following table lists each ATtiny microcontroller by the first release date of each datasheet.
The following are ATtiny development boards sold by Microchip Technology: