| Part Numbers | Manufacturer Name | Datasheet | Core Processor | Core Size | Speed | Connectivity | RAM Size | Number of I/O | Program Memory Size | Program Memory Type | EEPROM Size | Voltage - Supply (Vcc/Vdd) | Data Converters | Oscillator Type | Operating Temperature | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ATMEGA644PA-AUR | ATMEL CORP | AVR | 8-Bit | 20MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 1.8 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 85°C | 44-TQFP | |
| ATMEGA644P-20AQ | ATMEL CORP | AVR | 8-Bit | 20MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 2.7 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 105°C | 44-TQFP | |
| ATMEGA644PV-10AQ | ATMEL CORP | AVR | 8-Bit | 10MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 1.8 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 105°C | 44-TQFP | |
| ATMEGA644A-AUR | ATMEL CORP | AVR | 8-Bit | 20MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 1.8 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 85°C | 44-TQFP | |
| ATMEGA644PA-ANR | ATMEL CORP | AVR | 8-Bit | 20MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 1.8 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 105°C | 44-TQFP | |
| ATMEGA644V-10AUR | ATMEL CORP | AVR | 8-Bit | 10MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 1.8 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 85°C | 44-TQFP | |
| ATMEGA644P-20AUR | ATMEL CORP | AVR | 8-Bit | 20MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 2.7 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 85°C | 44-TQFP | |
| ATMEGA644PV-10AQR | ATMEL CORP | AVR | 8-Bit | 10MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 1.8 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 105°C | 44-TQFP | |
| ATMEGA644P-20AQR | ATMEL CORP | AVR | 8-Bit | 20MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 2.7 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 105°C | 44-TQFP | |
| ATMEGA644P-A15AZ | ATMEL CORP | AVR | 8-Bit | 16MHz | I²C, SPI, UART/USART | 32 | 64KB (32K x 16) | FLASH | 2K x 8 | 4K x 8 | 2.7 V ~ 5.5 V | A/D 8x10b | Internal | -40°C ~ 125°C | 44-TQFP |
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