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| Part Number | AT89C51RD2-RLRUM | AT89C51RD2-SLRUM | AT89C51RD2-RLTUM | AT89C51ED2-RLRUM | AT89C51ID2-RLRUM | AT89C51RB2-RLRUM | AT89C51RC2-RLRUM | AT89C51RD2-RLRIM |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Atmel | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Active | Active | Obsolete | Obsolete | Active | Active | Obsolete |
| Core Processor | 80C51 | 80C51 | 80C51 | 80C51 | 80C51 | 80C51 | 80C51 | 80C51 |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 60MHz | 60MHz | 60MHz | 60MHz | 60MHz | 60MHz | 60MHz | 60MHz |
| Connectivity | SPI, UART/USART | SPI, UART/USART | SPI, UART/USART | SPI, UART/USART | I²C, SPI, UART/USART | SPI, UART/USART | SPI, UART/USART | SPI, UART/USART |
| Peripherals | POR, PWM, WDT | POR, PWM, WDT | POR, PWM, WDT | POR, PWM, WDT | POR, PWM, WDT | POR, PWM, WDT | POR, PWM, WDT | POR, PWM, WDT |
| Number of I/O | 34 | 34 | 34 | 34 | 34 | 32 | 32 | 34 |
| Program Memory Size | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 16KB (16K x 8) | 32KB (32K x 8) | 64KB (64K x 8) |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash | Flash | Flash | Flash |
| EEPROM Size | - | - | - | 2K x 8 | 2K x 8 | - | - | - |
| RAM Size | 2K x 8 | 2K x 8 | 2K x 8 | 2K x 8 | 2K x 8 | 1.25K x 8 | 1.25K x 8 | 2K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V |
| Data Converters | - | - | - | - | - | - | - | - |
| Oscillator Type | External | External | External | External | External | External | External | External |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 44-LQFP | 44-LCC (J-Lead) | 44-LQFP | 44-LQFP | 44-LQFP | 44-LQFP | 44-LQFP | 44-LQFP |
| Supplier Device Package | 44-VQFP (10x10) | 44-PLCC (16.6x16.6) | 44-VQFP (10x10) | 44-VQFP (10x10) | 44-VQFP (10x10) | 44-VQFP (10x10) | 44-VQFP (10x10) | 44-VQFP (10x10) |
