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| PartNumber | ATMEGA644A-AUR | ATMEGA644A-MU | ATMEGA644A-AU |
| Description | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | 8-bit Microcontrollers - MCU 20 MHz Ind Temp |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | TQFP-44 | VQFN-44 | TQFP-44 |
| Series | ATmega644 | ATmega644 | ATmega644 |
| Core | AVR | AVR | AVR |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 20 MHz | 20 MHz | 20 MHz |
| Program Memory Size | 64 kB | 64 kB | 64 kB |
| Data RAM Size | 4 kB | 4 kB | 4 kB |
| ADC Resolution | 10 bit | 10 bit | 10 bit |
| Number of I/Os | 32 I/O | 32 I/O | 32 I/O |
| Operating Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Reel | Tray | Tray |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | Flash |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | SRAM | SRAM |
| Data ROM Size | 2 kB | 2 kB | 2 kB |
| Data ROM Type | EEPROM | EEPROM | EEPROM |
| Interface Type | 2-Wire, SPI, USART | 2-Wire, SPI, USART | 2-Wire, SPI, Serial, USART |
| Moisture Sensitive | Yes | - | Yes |
| Number of ADC Channels | 8 Channel | 8 | 8 |
| Number of Timers/Counters | 2 x 8 bit, 1 x 16 bit | 3 Timer | 3 Timer |
| Processor Series | megaAVR | megaAVR | megaAVR |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 2000 | 360 | 160 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 1.8 V | 1.8 V | - |
| Tradename | AVR | AVR | AVR |
| Watchdog Timers | Watchdog Timer | - | - |
| Unit Weight | 0.009640 oz | 0.032805 oz | 0.077179 oz |
| Manufacturer | Part # | Description | RFQ |
|---|---|---|---|
Microchip Technology / Atmel |
ATMEGA644A-AUR | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | |
| ATMEGA644A-MU | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-AU | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-PU | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-MUR | 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-MUR | Microcontrollers - MCU 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-AUR | Microcontrollers - MCU 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-MU | Microcontrollers - MCU 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-PU | Microcontrollers - MCU 8-bit Microcontrollers - MCU 20 MHz Ind Temp | ||
| ATMEGA644A-AU | Microcontrollers - MCU 8-bit Microcontrollers - MCU 20 MHz Ind Temp |