| PartNumber | AT89LP6440-20MU | AT89LP6440-20JU | AT89LP6440-20AU |
| Description | 8-bit Microcontrollers - MCU Single-Cycle 8051 64K ISP Flash | 8-bit Microcontrollers - MCU Single-Cycle 8051 64K ISP Flash | 8-bit Microcontrollers - MCU Single-Cycle 8051 64K ISP Flash |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Package / Case | VQFN-44 | PLCC-44 | TQFP-44 |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Packaging | Tray | Tube | Tray |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Processor Series | AT89x | AT89x | AT89x |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 360 | 27 | 160 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Mounting Style | - | SMD/SMT | SMD/SMT |
| Series | - | AT89LP6440 | - |
| Maximum Clock Frequency | - | 20 MHz | 20 MHz |
| Program Memory Size | - | 64 kB | 64 kB |
| Data RAM Size | - | 4.25 kB | 8 kB |
| ADC Resolution | - | 10 bit | 10 bit |
| Number of I/Os | - | 38 I/O | 38 I/O |
| Operating Supply Voltage | - | 2.4 V to 3.6 V | 2.4 V to 3.6 V |
| Minimum Operating Temperature | - | - 40 C | - 40 C |
| Maximum Operating Temperature | - | + 85 C | + 85 C |
| Height | - | 4.572 mm | - |
| Length | - | 17.653 mm | - |
| Product | - | MCU | - |
| Program Memory Type | - | Flash | Flash |
| Width | - | 17.653 mm | - |
| Data RAM Type | - | Flash | SRAM |
| Data ROM Size | - | 8 kB | 8192 B |
| Data ROM Type | - | Flash | EEPROM |
| Interface Type | - | I2C, SPI, UART | I2C, SPI, UART |
| Moisture Sensitive | - | Yes | Yes |
| Number of ADC Channels | - | 8 | 8 |
| Number of Timers/Counters | - | 3 Timer | 3 Timer |
| Supply Voltage Max | - | 3.6 V | 3.6 V |
| Supply Voltage Min | - | 2.4 V | 2.4 V |
| Unit Weight | - | 0.084185 oz | 0.009640 oz |