| PartNumber | AT80C51RD2-RLRUM | AT80C51RD2-RLTUM | AT80C51RD2-3CSUM |
| 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 | 8-bit Microcontrollers - MCU MCU 8-BIT AT80 CISC ROMless 3-5V |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | Through Hole |
| Package / Case | LQFP-44 | VQFP-44 | PDIL-40 |
| Series | 80C | 80C | 80C |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 60 MHz | 40 MHz | 40 MHz |
| Data RAM Size | 1.25 kB | 1.25 kB | 1.25 kB |
| ADC Resolution | No ADC | No ADC | No ADC |
| Number of I/Os | 32 I/O | 32 I/O | 32 I/O |
| Operating Supply Voltage | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Reel | Tray | Tube |
| Height | 1.45 mm | 1.45 mm | 4.95 mm |
| Length | 10.1 mm | 10.1 mm | 53.21 mm |
| Program Memory Type | ROMLess | ROMLess | ROMLess |
| Width | 10.1 mm | 10.1 mm | 14.73 mm |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Interface Type | SPI, UART | SPI, UART | SPI, UART |
| Moisture Sensitive | Yes | Yes | - |
| Number of Timers/Counters | 3 Timer | 3 Timer | 3 Timer |
| Processor Series | AT80x | AT80C51RD2 | AT80C51RD2 |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 1500 | 160 | 10 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 2.7 V | 2.7 V | 2.7 V |
| Unit Weight | 0.012561 oz | - | 0.070548 oz |
| Program Memory Size | - | 0 B | 0 B |
| Product | - | MCU | MCU |
| Data RAM Type | - | SRAM | SRAM |
| Data ROM Size | - | - | - |
| Data ROM Type | - | - | - |
| Analog Supply Voltage | - | - | - |
| DAC Resolution | - | - | - |
| I/O Voltage | - | - | - |
| Number of ADC Channels | - | - | - |
| Watchdog Timers | - | Watchdog Timer | Watchdog Timer |