| Base Product Number | AT90USB646 |
| Category | Integrated Circuits (ICs) |
| Connectivity | EBI/EMI, I?C, SPI, UART/USART, USB |
| Core Processor | AVR |
| Core Size | 8-Bit |
| Data Converters | A/D 8x10b |
| EEPROM Size | 2K x 8 |
| Mfr | Microchip Technology |
| Mounting Type | Surface Mount |
| Number of I/O | 48 |
| Operating Temperature | -40?C ~ 85?C (TA) |
| Oscillator Type | Internal |
| Package | Tape & Reel (TR) |
| Package / Case | 64-VFQFN Exposed Pad |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT |
| Product Status | Active |
| Program Memory Size | 64KB (64K x 8) |
| Program Memory Type | FLASH |
| RAM Size | 4K x 8 |
| Series | AVR? 90USB |
| Speed | 16MHz |
| Supplier Device Package | 64-QFN (9x9) |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V |