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| Part Number | AT90USB1287-MU | 
| Datasheet | AT90USB1287-MU datasheet | 
| Description | IC MCU 8BIT 128KB FLASH 64QFN | 
| Manufacturer | Microchip Technology | 
| Series | AVR® 90USB | 
| Part Status | Active | 
| Core Processor | AVR | 
| Core Size | 8-Bit | 
| Speed | 16MHz | 
| Connectivity | EBI/EMI, I²C, SPI, UART/USART, USB, USB OTG | 
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | 
| Number of I/O | 48 | 
| Program Memory Size | 128KB (128K x 8) | 
| Program Memory Type | FLASH | 
| EEPROM Size | 4K x 8 | 
| RAM Size | 8K x 8 | 
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 
| Data Converters | A/D 8x10b | 
| Oscillator Type | Internal | 
| Operating Temperature | -40°C ~ 85°C (TA) | 
| Package / Case | Surface Mount | 
| Supplier Device Package | 64-VFQFN Exposed Pad | 
| Base Part Number | 64-QFN (9x9) |