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| Part Number | C8051F521-C-IM | 
| Datasheet | C8051F521-C-IM datasheet | 
| Description | IC MCU 8BIT 8KB FLASH 10DFN | 
| Manufacturer | Silicon Labs | 
| Series | C8051F52x | 
| Part Status | Active | 
| Core Processor | 8051 | 
| Core Size | 8-Bit | 
| Speed | 25MHz | 
| Connectivity | SPI, UART/USART | 
| Peripherals | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | 
| Number of I/O | 6 | 
| Program Memory Size | 8KB (8K x 8) | 
| Program Memory Type | FLASH | 
| EEPROM Size | - | 
| RAM Size | 256 x 8 | 
| Voltage - Supply (Vcc/Vdd) | 2V ~ 5.25V | 
| Data Converters | A/D 6x12b | 
| Oscillator Type | Internal | 
| Operating Temperature | -40°C ~ 125°C (TA) | 
| Package / Case | Surface Mount | 
| Supplier Device Package | 10-VFDFN Exposed Pad | 
| Base Part Number | 10-DFN (3x3) |