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| PartNumber | C8051F521-C-IM | C8051F521-C-IMR | C8051F521-IM |
| Description | 8-bit Microcontrollers - MCU 8051 25 MHz 8 kB 5 V 8-bit MCU | 8-bit Microcontrollers - MCU 25 MIPS, 8 kB, 256, SPI, UART, DFN10 | IC MCU 8BIT 8KB FLASH 10DFN |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | - |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | DFN-10 | DFN-10 | - |
| Series | C8051F521 | C8051F521 | - |
| Core | 8051 | 8051 | - |
| Data Bus Width | 8 bit | 8 bit | - |
| Maximum Clock Frequency | 25 MHz | 25 MHz | - |
| Program Memory Size | 8 kB | 8 kB | - |
| Data RAM Size | 256 B | 256 B | - |
| ADC Resolution | 12 bit | 12 bit | - |
| Number of I/Os | 6 I/O | 6 I/O | - |
| Operating Supply Voltage | 2 V to 5.25 V | 2 V to 5.25 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 125 C | + 125 C | - |
| Qualification | AEC-Q100 | - | - |
| Packaging | Tube | Reel | - |
| Program Memory Type | Flash | Flash | - |
| Brand | Silicon Labs | Silicon Labs | - |
| Data RAM Type | RAM | RAM | - |
| Interface Type | SPI, UART | SPI, UART | - |
| Number of ADC Channels | 1 Channel | 1 Channel | - |
| Number of Timers/Counters | 3 Timer | 3 Timer | - |
| Processor Series | C8051F52x | C8051F52x | - |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | - |
| Factory Pack Quantity | 122 | 1500 | - |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | - |
| Supply Voltage Max | 5.25 V | 5.25 V | - |
| Supply Voltage Min | 2 V | 2 V | - |
| Unit Weight | 0.001764 oz | 0.001764 oz | - |
| Moisture Sensitive | - | Yes | - |