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| PartNumber | AT80C31X2-RLTUL | AT80C31X2-3CSUL | AT80C31X2-3CSUM |
| Description | 8-bit Microcontrollers - MCU RLESS 31X2 40MHZ 3V COM | 8-bit Microcontrollers - MCU MICRO RLESS31X2 60MHZ 3V COM TEMP | IC MCU 8BIT ROMLESS 40PDIL |
| Manufacturer | Microchip | Microchip | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | Through Hole | - |
| Package / Case | VQFP-44 | PDIL-40 | - |
| Series | 80C | 80C | - |
| Core | 80C51 | 80C51 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 60 MHz | 60 MHz | - |
| Program Memory Size | 0 B | 0 B | - |
| Data RAM Size | 128 B | 128 B | - |
| 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 | 0 C | - |
| Maximum Operating Temperature | + 85 C | + 70 C | - |
| Height | 1.45 mm | 4.06 mm | - |
| Length | 10.1 mm | 51.75 mm | - |
| Product | MCU | MCU | - |
| Program Memory Type | ROMless | ROMless | - |
| Width | 10.1 mm | 13.52 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Data RAM Type | RAM | RAM | - |
| Interface Type | UART | UART | - |
| DAC Resolution | No DAC | No DAC | - |
| Number of Timers/Counters | 2 x 16 bit | 2 x 16 bit | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 800 | 216 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Supply Voltage Max | 5.5 V | 5.5 V | - |
| Supply Voltage Min | 2.7 V, 4.5 V | 2.7 V, 4.5 V | - |
| Watchdog Timers | Watchdog Timer | Watchdog Timer | - |