8-bit CISC microcontroller featuring an 8051 core, 20 MHz maximum clock rate, and 24KB Flash program memory. This surface-mount device offers 1.375KB RAM, 40 programmable I/Os, and 3 timers. It includes SPI and UART interfaces and operates from 3.3V to 5.5V. Packaged in a 44-pin LQFP (10x10mm) with 0.8mm pin pitch, it supports an 8-channel ADC and operates within a -40°C to 85°C temperature range.
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| Basic Package Type | Lead-Frame SMT |
| Package Family Name | QFP |
| Package/Case | LQFP |
| Package Description | Low Profile Quad Flat Package |
| Lead Shape | Gull-wing |
| Pin Count | 44 |
| PCB | 44 |
| Package Length (mm) | 10 |
| Package Width (mm) | 10 |
| Package Height (mm) | 1.4 |
| Seated Plane Height (mm) | 1.6(Max) |
| Pin Pitch (mm) | 0.8 |
| Package Material | Plastic |
| Mounting | Surface Mount |
| Jedec | MS-026BCB |
| Family Name | AT89 |
| Data Bus Width | 8bit |
| Instruction Set Architecture | CISC |
| Maximum Clock Rate | 20MHz |
| Maximum CPU Frequency | 20MHz |
| Device Core | 8051 |
| Program Memory Type | Flash |
| Program Memory Size | 24KB |
| RAM Size | 1.375KB |
| Number of Programmable I/Os | 40 |
| Core Architecture | 8051 |
| Programmability | Yes |
| Number of Timers | 3 |
| Interface Type | SPI/UART |
| CAN | 0 |
| I2C | 0 |
| SPI | 1 |
| Ethernet | 0 |
| UART | 1 |
| USART | 0 |
| USB | 0 |
| I2S | 0 |
| Max Operating Supply Voltage | 5.5V |
| Min Operating Temperature | -40°C |
| Max Operating Temperature | 85°C |
| ADC Channels | 8 |
| Number of ADCs | Single |
| Cage Code | 60991 |
| EU RoHS | Yes |
| HTS Code | 8542310001 |
| Schedule B | 8542310000 |
| Automotive | No |
| AEC Qualified | No |
| PPAP | No |
| RoHS Versions | 2011/65/EU, 2015/863 |
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