| PartNumber | AT80C51RD2-SLSUM | AT80C51RD2-SLRUM | AT80C51RD2-SLSIM |
| Description | 8-bit Microcontrollers - MCU MCU 8-Bit HI Perform ROMless 3-5V | 8-bit Microcontrollers - MCU MCU 8-Bit HI Perform ROMless 3-5V | IC MCU 8BIT ROMLESS 44PLCC |
| Manufacturer | Microchip | Microchip | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | PLCC-44 | PLCC-44 | - |
| Series | 80C | 80C | - |
| Core | 8051 | 8051 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 60 MHz | 40 MHz | - |
| Program Memory Size | 1 kB | 0 B | - |
| Data RAM Size | 1.25 kB | 1.25 kB | - |
| ADC Resolution | No ADC | No ADC | - |
| Number of I/Os | 32 I/O | 32 I/O | - |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tube | Reel | - |
| Height | 3.48 mm | 3.69 mm | - |
| Length | 16.7 mm | 16.7 mm | - |
| Product | MCU | MCU | - |
| Program Memory Type | XRAM | ROMLess | - |
| Width | 16.7 mm | 16.7 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Interface Type | SPI, UART | SPI, UART | - |
| Moisture Sensitive | Yes | Yes | - |
| Number of Timers/Counters | 3 Timer | 3 Timer | - |
| Processor Series | AT80x | AT80C51RD2 | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 27 | 500 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 2.7 V | 2.7 V | - |
| Unit Weight | 0.084185 oz | 0.084658 oz | - |
| Data RAM Type | - | SRAM | - |
| Data ROM Size | - | - | - |
| Data ROM Type | - | - | - |
| Analog Supply Voltage | - | - | - |
| DAC Resolution | - | - | - |
| I/O Voltage | - | - | - |
| Number of ADC Channels | - | - | - |
| Watchdog Timers | - | Watchdog Timer | - |