| Parameters | 
                                                                                                            
                                            | Mfr | Silicon Labs | 
                                                                            
                                            | Series | Universal Bee | 
                                                                            
                                            | Package | Tray | 
                                                                            
                                            | Product Status | Discontinued at Digi-Key | 
                                                                            
                                            | Core Processor | CIP-51 8051 | 
                                                                            
                                            | Core Size | 8-Bit | 
                                                                            
                                            | Speed | 48MHz | 
                                                                            
                                            | Connectivity | EBI/EMI, I²C, SMBus, SPI, UART/USART, USB | 
                                                                            
                                            | Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | 
                                                                            
                                            | Number of I/O | 40 | 
                                                                            
                                            | Program Memory Size | 32KB (32K x 8) | 
                                                                            
                                            | Program Memory Type | FLASH | 
                                                                            
                                            | EEPROM Size | - | 
                                                                            
                                            | RAM Size | 2.25K x 8 | 
                                                                            
                                            | Voltage - Supply (Vcc/Vdd) | 2.65V ~ 3.6V | 
                                                                            
                                            | Data Converters | A/D 32x10b | 
                                                                            
                                            | Oscillator Type | Internal | 
                                                                            
                                            | Operating Temperature | -40°C ~ 85°C (TA) | 
                                                                            
                                            | Mounting Type | Surface Mount | 
                                                                            
                                            | Package / Case | 48-TQFP | 
                                                                            
                                            | Supplier Device Package | 48-TQFP (7x7) | 
                                                                            
                                            | Base Product Number | EFM8UB20 | 
                                                                            
                                            | Moisture Sensitivity Level (MSL) | 3  (168 Hours) | 
                                                                            
                                            | ECCN | 3A991A2 | 
                                                                            
                                            | HTSUS | 8542.31.0001 | 
                                                                            
                                            | Other Names | 336-3188 | 
                                                                            
                                            | Standard Package | 250 | 
                                                                                                    
                            
                         
                                                CIP-51 8051 Universal Bee Microcontroller IC 8-Bit 48MHz 32KB (32K x 8) FLASH 48-TQFP (7x7)