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| PartNumber | AT8025 | AT80251G | AT80251G2D |
| Description | |||
| Manufacturer | Atmel | Atmel | - |
| Product Category | Embedded - Microcontrollers | Embedded - Microcontrollers | - |
| Series | 8x251 | 8x251 | - |
| Packaging | Tube | Tube | - |
| Package Case | 40-DIP (0.600", 15.24mm) | 40-DIP (0.600", 15.24mm) | - |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | - |
| Supplier Device Package | 40-PDIL | 40-PDIL | - |
| Number of I O | 32 | 32 | - |
| Speed | 24MHz | 24MHz | - |
| EEPROM Size | - | - | - |
| Core Processor | C251 | C251 | - |
| RAM Size | 1K x 8 | 1K x 8 | - |
| Program Memory Type | ROMless | ROMless | - |
| Peripherals | POR, PWM, WDT | POR, PWM, WDT | - |
| Connectivity | EBI/EMI, I2C, Microwire, SPI, UART/USART | EBI/EMI, I2C, Microwire, SPI, UART/USART | - |
| Voltage Supply Vcc Vdd | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V | - |
| Core Size | 8/16-Bit | 8/16-Bit | - |
| Program Memory Size | - | - | - |
| Data Converters | - | - | - |
| Oscillator Type | Internal | Internal | - |