| PartNumber | AT89C51ID2-RLTUM | AT89C51ID2-SLRUM | AT89C51ID2-RLRUM |
| Description | 8-bit Microcontrollers - MCU C51ID2 64K FLASH 32KHz 3-5.5V | 8-bit Microcontrollers - MCU C51ID2 64K FLASH TWI 32KHz 5V | 8-bit Microcontrollers - MCU C51ID2 64K FLASH 32KHz 3-5.5V |
| 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 | SMD/SMT |
| Package / Case | VQFP-44 | PLCC-44 | LQFP-44 |
| Series | 89C | - | - |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 60 MHz | 60 MHz | 60 MHz |
| Program Memory Size | 64 kB | 64 kB | 64 kB |
| Data RAM Size | 1.75 kB | 2 kB | 2 kB |
| ADC Resolution | No ADC | No ADC | No ADC |
| Number of I/Os | 34 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 | - | - |
| Maximum Operating Temperature | + 85 C | - | - |
| Packaging | Tray | Reel | Reel |
| Height | 1.45 mm | - | - |
| Length | 10.1 mm | - | - |
| Product | MCU | MCU | MCU |
| Program Memory Type | Flash | Flash | Flash |
| Width | 10.1 mm | - | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | XRAM | - | - |
| Data ROM Size | 2 kB | - | - |
| Data ROM Type | EEPROM | - | - |
| Interface Type | SPI, TWI, UART | SPI, TWI, UART | SPI, TWI, UART |
| Moisture Sensitive | Yes | Yes | - |
| Number of Timers/Counters | 3 Timer | 3 Timer | 3 Timer |
| Processor Series | AT89x | AT89x | AT89x |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 160 | 500 | 1500 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 5.5 V | - | - |
| Supply Voltage Min | 2.7 V | - | - |
| Unit Weight | 0.012032 oz | 0.084185 oz | 0.012561 oz |