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| PartNumber | SIM3U166-B-GM | SIM3U164-B-GMR | SIM3U164-B-GM |
| Description | ARM Microcontrollers - MCU ARM Cortex-32-bit 80 MHz 256 kB USB EMIF MCU | ARM Microcontrollers - MCU USB, 256KB, QFN40 | ARM Microcontrollers - MCU ARM Cortex-32-bit 80 MHz 256 kB USB MCU |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | Silicon Laboratories |
| Product Category | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | - | SMD/SMT |
| Package / Case | QFN-64 | - | QFN-40 |
| Series | SIM3U166 | SIM3U164 | SIM3U164 |
| Core | ARM Cortex M3 | - | ARM Cortex M3 |
| Data Bus Width | 32 bit | - | 32 bit |
| Maximum Clock Frequency | 80 MHz | - | 80 MHz |
| Program Memory Size | 256 kB | - | 256 kB |
| Data RAM Size | 32 kB | - | 32 kB |
| Number of I/Os | 65 I/O | - | 28 I/O |
| Operating Supply Voltage | 1.8 V to 3.6 V | - | 1.8 V to 3.6 V |
| Minimum Operating Temperature | - 40 C | - | - 40 C |
| Maximum Operating Temperature | + 85 C | - | + 85 C |
| Packaging | Tray | Reel | Tray |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Interface Type | 2 x I2C, I2S, 3 x SPI, 2 x USART, 2 x UART | - | 2 x I2C, I2S, 3 x SPI, 2 x USART, 2 x UART |
| Moisture Sensitive | Yes | Yes | Yes |
| Number of Timers/Counters | 2 Timer | - | 2 Timer |
| Processor Series | SIM3U1xx | - | SIM3U1xx |
| Product Type | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| Factory Pack Quantity | 260 | 2500 | 490 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Tradename | Precision32 | Precision32 | Precision32 |
| Unit Weight | 0.007277 oz | - | 0.004138 oz |