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| Part Number | AT89C1051-12SI | AT89C1051U-12SI | AT89C2051-12SI | AT89C4051-12SI | AT89C1051-12SC |
|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Core Processor | 8051 | 8051 | 8051 | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 12MHz | 12MHz | 12MHz | 12MHz | 12MHz |
| Connectivity | - | UART/USART | UART/USART | UART/USART | - |
| Peripherals | LED | LED | LED | Brown-out Detect/Reset, LED, POR | LED |
| Number of I/O | 15 | 15 | 15 | 15 | 15 |
| Program Memory Size | 1KB (1K x 8) | 1KB (1K x 8) | 2KB (2K x 8) | 4KB (4K x 8) | 1KB (1K x 8) |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash |
| EEPROM Size | - | - | - | - | - |
| RAM Size | 64 x 8 | 64 x 8 | 128 x 8 | 128 x 8 | 64 x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 6V | 2.7V ~ 6V | 4V ~ 6V | 4V ~ 6V | 2.7V ~ 6V |
| Data Converters | - | - | - | - | - |
| Oscillator Type | Internal | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 0°C ~ 70°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) | 20-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC | 20-SOIC |
