| Specifications | ATtiny204 | ATtiny404 | ATtiny804 | ATtiny1604 |
|---|---|---|---|---|
| Flash (program memory) | 2048 bytes | 4096 bytes | 8192 bytes | 16384 bytes |
| Flash w/Optiboot | 1536 bytes | 3584 bytes | 7680 bytes | 15872 bytes |
| RAM | 128 bytes | 256 bytes | 512 bytes | 1024 bytes |
| EEPROM | 64 bytes | 128 bytes | 128 bytes | 256 bytes |
| Bootloader | Optiboot (optional, not recommended) | Optiboot (optional, not recommended)\ Optiboot (optional) | Optiboot (optional) | |
| GPIO Pins | 12 (11 usable) | 12 (11 usable) | 12 (11 usable) | 12 (11 usable) |
| ADC Channels | 10 (9 usable) | 10 (9 usable) | 10 (9 usable) | 10 (9 usable) |
| DAC | No | No | No | No |
| PWM Channels | 6 | 6 | 6 | 6 |
| Timer Type B | 1 | 1 | 1 | 1 |
| Timer Type D | No | No | No | No |
| Interfaces | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C | UART, SPI, I2C |
| Clock options | Internal 20/16/10/8/5/4/1 MHz | Internal 20/16/10/8/5/4/1 MHz | Internal 20/16/10/8/5/4/1 MHz | Internal 20/16/10/8/5/4/1 MHz |