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| Part Number | AT89C51-33PI | AT89C51-33AI | AT89C51-33JI |
|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete |
| Core Processor | 80C51 | 80C51 | 80C51 |
| Core Size | 8-Bit | 8-Bit | 8-Bit |
| Speed | 33MHz | 33MHz | 33MHz |
| Connectivity | UART/USART | UART/USART | UART/USART |
| Peripherals | - | - | - |
| Number of I/O | 32 | 32 | 32 |
| Program Memory Size | 4KB (4K x 8) | 4KB (4K x 8) | 4KB (4K x 8) |
| Program Memory Type | Flash | Flash | Flash |
| EEPROM Size | - | - | - |
| RAM Size | 128 x 8 | 128 x 8 | 128 x 8 |
| Voltage - Supply (Vcc/Vdd) | 4V ~ 6V | 4V ~ 6V | 4V ~ 6V |
| Data Converters | - | - | - |
| Oscillator Type | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Through Hole | Surface Mount | Surface Mount |
| Package / Case | 40-DIP (0.600", 15.24mm) | 44-TQFP | 44-LCC (J-Lead) |
| Supplier Device Package | 40-PDIP | 44-TQFP (10x10) | 44-PLCC (16.6x16.6) |
