| 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AT89C55WD-24PU | ATMEL CORP | 8051 | 8-Bit | 24MHz | UART/USART | 32 | 20KB (20K x 8) | FLASH | - | 256 x 8 | 4.5 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 40-DIP (0.600, 15.24mm) | |
| AT89S8253-24JU | ATMEL CORP | 8051 | 8-Bit | 24MHz | SPI, UART/USART | 32 | 12KB (12K x 8) | FLASH | 2K x 8 | 256 x 8 | 2.7 V ~ 5.5 V | - | External | -40°C ~ 85°C | 44-LCC (J-Lead) | |
| AT89S8253-24PU | ATMEL CORP | 8051 | 8-Bit | 24MHz | SPI, UART/USART | 32 | 12KB (12K x 8) | FLASH | 2K x 8 | 256 x 8 | 2.7 V ~ 5.5 V | - | External | -40°C ~ 85°C | 40-DIP (0.600, 15.24mm) | |
| AT89C51RC-24JU | ATMEL CORP | 8051 | 8-Bit | 24MHz | SPI, UART/USART | 32 | 32KB (32K x 8) | FLASH | - | 512 x 8 | 4 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LCC (J-Lead) | |
| AT89C2051-12SU | ATMEL CORP | 8051 | 8-Bit | 12MHz | UART/USART | 15 | 2KB (2K x 8) | FLASH | - | 128 x 8 | 2.7 V ~ 6 V | - | Internal | -40°C ~ 85°C | 20-SOIC (0.295, 7.50mm Width) | |
| AT89C4051-12SU | ATMEL CORP | 8051 | 8-Bit | 12MHz | UART/USART | 15 | 4KB (4K x 8) | FLASH | - | 128 x 8 | 2.7 V ~ 6 V | - | Internal | -40°C ~ 85°C | 20-SOIC (0.295, 7.50mm Width) | |
| AT89LP51-20AU | ATMEL CORP | 8051 | 8-Bit | 20MHz | EBI/EMI, I²C, SPI, UART/USART | 36 | 4KB (4K x 8) | FLASH | - | 256 x 8 | 2.4 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-TQFP | |
| AT89LP52-20AU | ATMEL CORP | 8051 | 8-Bit | 20MHz | EBI/EMI, I²C, SPI, UART/USART | 36 | 8KB (8K x 8) | FLASH | - | 256 x 8 | 2.4 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-TQFP | |
| AT89LP52-20JU | ATMEL CORP | 8051 | 8-Bit | 20MHz | EBI/EMI, I²C, SPI, UART/USART | 36 | 8KB (8K x 8) | FLASH | - | 256 x 8 | 2.4 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-LCC (J-Lead) | |
| AT89LP52-20MU | ATMEL CORP | 8051 | 8-Bit | 20MHz | EBI/EMI, I²C, SPI, UART/USART | 36 | 8KB (8K x 8) | FLASH | - | 256 x 8 | 2.4 V ~ 5.5 V | - | Internal | -40°C ~ 85°C | 44-VFQFN Exposed Pad |
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