| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ATMEGA644P-20PQ | 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 | 40-DIP (0.600, 15.24mm) | |
| ATMEGA644A-PU | 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 | 40-DIP (0.600, 15.24mm) | |
| ATMEGA644PA-PU | 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 | 40-DIP (0.600, 15.24mm) | |
| ATMEGA644-20PU | 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 | 40-DIP (0.600, 15.24mm) | |
| ATMEGA644P-20PU | 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 | 40-DIP (0.600, 15.24mm) |
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