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| PartNumber | C8051T621-GM | C8051T620-GM | C8051T620-GMR |
| Description | 8-bit Microcontrollers - MCU MCU 8051 48 MHz 16 kB OTP 8-bit MCU | 8-bit Microcontrollers - MCU MCU 8051 48 MHz 16 kB OTP 8-bit MCU | 8-bit Microcontrollers - MCU USB-OTP-16K-ADC-QFN32 |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | Silicon Laboratories |
| Product Category | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | QFN-32 | QFN-32 | - |
| Series | C8051T621 | C8051T620 | C8051T620 |
| Core | 8051 | 8051 | 8051 |
| Data Bus Width | 8 bit | 8 bit | 8 bit |
| Maximum Clock Frequency | 48 MHz | 48 MHz | - |
| Program Memory Size | 16 kB | 16 kB | - |
| Data RAM Size | 1.25 kB | 1.25 kB | - |
| Number of I/Os | 24 I/O | 24 I/O | - |
| Operating Supply Voltage | 1.8 V to 5.25 V | 1.8 V to 5.25 V | 1.8 V to 5.25 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tube | Tube | Reel |
| Height | 0.88 mm | 0.88 mm | - |
| Length | 5 mm | 5 mm | - |
| Program Memory Type | EPROM | EPROM | - |
| Width | 5 mm | 5 mm | - |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Data RAM Type | SRAM | SRAM | - |
| Interface Type | I2C, SPI, UART, USB | I2C, SPI, UART, USB | - |
| Number of Timers/Counters | 4 Timer | 4 Timer | - |
| Processor Series | C8051 | C8051 | C8051 |
| Product Type | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU | 8-bit Microcontrollers - MCU |
| Factory Pack Quantity | 73 | 73 | 1500 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Unit Weight | 0.002449 oz | 0.002449 oz | - |
| ADC Resolution | - | 10 bit | - |
| Number of ADC Channels | - | 21 | - |
| Moisture Sensitive | - | - | Yes |