| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AT80C51RD2-RLRUM | ATMEL CORP | 80C51 | 8-Bit | 40MHz | UART/USART | 32 | - | ROMless | - | 1K x 8 | 2.7 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| AT80C51RD2-RLTUM | ATMEL CORP | 80C51 | 8-Bit | 40MHz | UART/USART | 32 | - | ROMless | - | 1K x 8 | 4.5 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| AT80C51ID2-RLTIM | ATMEL CORP | 80C51 | 8-Bit | 20MHz | - | 32 | - | ROMless | - | 2K x 8 | - | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| TSC80251G2D-L16CE | ATMEL CORP | C251 | 8/16-Bit | 16MHz | EBI/EMI, I²C, Microwire, SPI, UART/USART | 32 | - | ROMless | - | 1K x 8 | 2.7 V ~ 5.5 V | - | Internal | 0°C ~ 70°C | 44-LQFP | |
| AT80C51ID2-RLTIL | ATMEL CORP | 80C51 | 8-Bit | 20MHz | - | 32 | - | ROMless | - | 2K x 8 | - | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| AT80C51RD2-RLTIM | ATMEL CORP | 80C51 | 8-Bit | 40MHz | UART/USART | 32 | - | ROMless | - | 1K x 8 | 4.5 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| TSC80251G2D-L16CER | ATMEL CORP | C251 | 8/16-Bit | 16MHz | EBI/EMI, I²C, Microwire, SPI, UART/USART | 32 | - | ROMless | - | 1K x 8 | 2.7 V ~ 5.5 V | - | Internal | 0°C ~ 70°C | 44-LQFP | |
| AT80251G2D-RLTUM | ATMEL CORP | C251 | 8/16-Bit | 24MHz | EBI/EMI, I²C, Microwire, SPI, UART/USART | 32 | - | ROMless | - | 1K x 8 | 4.5 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| AT80C31X2-RLTUL | ATMEL CORP | 80C51 | 8-Bit | 30/20MHz | UART/USART | 32 | - | ROMless | - | 128 x 8 | 2.7 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LQFP | |
| AT80C31X2-RLTUM | ATMEL CORP | 80C51 | 8-Bit | 40/20MHz | UART/USART | 32 | - | ROMless | - | 128 x 8 | 4.5 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LQFP |
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