| PartNumber | AT89LP51IC2-20AAU | AT89LP51IC2-20JU | AT89LP51IC2-20AU |
| Description | 8-bit Microcontrollers - MCU Sngle-Cycle 8051 32K ISP Flsh,2.4-5.5V | 8-bit Microcontrollers - MCU Sngle-Cycle 8051 32K ISP Flsh,2.4-5.5V | Microcontrollers - MCU 8-bit Microcontrollers - MCU Sngle-Cycle 8051 32K ISP Flsh,2.4-5.5V |
| Manufacturer | Microchip | Microchip | Atmel |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | Embedded - Microcontrollers |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | LQFP-44 | PLCC-44 | - |
| Core | 8051 | 8051 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 20 MHz | 20 MHz | - |
| Program Memory Size | 64 kB | 64 kB | 32KB (32K x 8) |
| Data RAM Size | 256 kB | 256 kB | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tray | Tube | Tray |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | - |
| Processor Series | AT89LP51IC2 | AT89LP51IC2 | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 160 | 27 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Unit Weight | 0.012561 oz | 0.084185 oz | - |
| RoHS | - | Y | - |
| Moisture Sensitive | - | Yes | - |
| Series | - | - | 89LP |
| Package Case | - | - | 44-TQFP |
| Operating Temperature | - | - | -40°C ~ 85°C (TA) |
| Supplier Device Package | - | - | 44-TQFP (10x10) |
| Number of I O | - | - | 40 |
| Speed | - | - | 20MHz |
| EEPROM Size | - | - | - |
| Core Processor | - | - | 8051 |
| RAM Size | - | - | 1.375K x 8 |
| Program Memory Type | - | - | FLASH |
| Peripherals | - | - | Brown-out Detect/Reset, POR, PWM, WDT |
| Connectivity | - | - | EBI/EMI, I2C, SPI, UART/USART |
| Voltage Supply Vcc Vdd | - | - | 2.4 V ~ 5.5 V |
| Core Size | - | - | 8-Bit |
| Data Converters | - | - | A/D 7x10b |
| Oscillator Type | - | - | Internal |