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| Part Number | C8051F221 | C8051F221R | C8051F226 | C8051F231 | C8051F321 | C8051F121 | C8051F220 |
|---|---|---|---|---|---|---|---|
| Manufacturer | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs | Silicon Labs |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Core Processor | 8051 | 8051 | 8051 | 8051 | 8051 | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 25MHz | 25MHz | 25MHz | 25MHz | 25MHz | 100MHz | 25MHz |
| Connectivity | SPI, UART/USART | SPI, UART/USART | SPI, UART/USART | SPI, UART/USART | SMBus (2-Wire/I²C), SPI, UART/USART, USB | EBI/EMI, SMBus (2-Wire/I²C), SPI, UART/USART | SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, WDT | Brown-out Detect/Reset, POR, WDT | Brown-out Detect/Reset, POR, WDT | Brown-out Detect/Reset, POR, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, PWM, Temp Sensor, WDT | Brown-out Detect/Reset, POR, WDT |
| Number of I/O | 22 | 22 | 32 | 22 | 21 | 32 | 32 |
| Program Memory Size | 8KB (8K x 8) | 8KB (8K x 8) | 8KB (8K x 8) | 8KB (8K x 8) | 16KB (16K x 8) | 128KB (128K x 8) | 8KB (8K x 8) |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash | Flash | Flash |
| EEPROM Size | - | - | - | - | - | - | - |
| RAM Size | 256 x 8 | 256 x 8 | 1.25K x 8 | 256 x 8 | 2.25K x 8 | 8.25K x 8 | 256 x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 3V ~ 3.6V | 2.7V ~ 3.6V |
| Data Converters | A/D 22x8b | A/D 22x8b | A/D 32x8b | - | A/D 13x10b | A/D 8x8b, 8x12b; D/A 2x12b | A/D 32x8b |
| Oscillator Type | Internal | Internal | 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) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 32-LQFP | 32-LQFP | 48-TQFP | 32-LQFP | 28-VFQFN Exposed Pad | 64-TQFP | 48-TQFP |
| Supplier Device Package | 32-LQFP (7x7) | 32-LQFP (7x7) | 48-TQFP (7x7) | 32-LQFP (7x7) | 28-MLP (5x5) | 64-TQFP (10x10) | 48-TQFP (7x7) |
