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| Part Number | T89C51RD2-SMSIM | T89C51RD2-SLSIM |
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete |
| Core Processor | 80C51 | 8051 |
| Core Size | 8-Bit | 8-Bit |
| Speed | 40MHz | 40MHz |
| Connectivity | SPI, UART/USART | SPI, UART/USART |
| Peripherals | POR, PWM, WDT | POR, PWM, WDT |
| Number of I/O | 48 | 32 |
| Program Memory Size | 64KB (64K x 8) | 64KB (64K x 8) |
| Program Memory Type | Flash | Flash |
| EEPROM Size | 2K x 8 | 2K x 8 |
| RAM Size | 1.25K x 8 | 1.25K x 8 |
| Voltage - Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Data Converters | - | - |
| Oscillator Type | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | 68-LCC (J-Lead) | 44-LCC (J-Lead) |
| Supplier Device Package | 68-PLCC (24.23x24.23) | 44-PLCC (16.6x16.6) |
