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USB to Serial BridgeXR21B142x Family Provides Superior Performance and Ease of DesignFeatures• Highly-Integrated Device Eliminates Need forExternal Components· Industry leading +/- 15kV ESD on USBD+/USBD-· Internal 48MHz oscillator· Integrated 5V to 3.3V LDO with regulated 3.3V output• USB 2.0 (Full-Speed) Compliant Interface· USB suspend, resume, remote wake-up· Bus-powered or self-powered configuration· Unique pre-programmed USB serial number· HID class USB interface (XR21B1421)• Enhanced UART Features· Any baud rate up to 12Mbps· 512-byte TX and 512-byte RX FIFOs· Auto hardware/software flow control· Auto RS-485 half-duplex direction control· Multidrop and half-duplex modes· Full modem interface or GPIOs· 5V tolerant inputs• Up to 10 Fully Configurable GPIOs· Push-pull or open-drain output· Inputs with internal pull-up/pull-down resistors· TX or RX LED toggling· Configurable clock output· Suspend state GPIO configuration• Space Saving Package Options· QFN-24, QFN-28, QFN-40 and LQFP-64 packagesVBUS_SENSEUSBD+USBD-RESET#VCCVCC_REGGNDApplications• Smart grid data collection• Data aggregators and concentrators• Security and access control systems• ATM and gaming terminals• Rugged USB to serial convertersHID Target Applications• Portable consumer products• Keyboard, video, mouse• Medical Diagnostics· Biometric data collection· Portable blood glucose metersInternalOscillator(48MHz)USB Slave InterfaceUSBDescriptorsLDOOTP3V3FractionalBRGInternalStatus andControlRegistersUART CH A512-byteTX FIFO512-byteRX FIFOGPIOs/Modem IOUART CH B(Same as CH A)VIOTXARXAGPIOA9/RXTAGPIOA8/TXTAGPIOA7/XENAGPIOA6/CLKAGPIOA5/RTSA#/XENAGPIOA4/CTSA#GPIOA3/DTRA#GPIOA2/DSRA#GPIOA1/CDA#GPIOA0/RIA#TXBRXBGPIOB[9-0]USB_STAT1USB_STAT2For more information or to buy products, go to www.FutureElectronics.com/FTM©2014 Exar Corporation. All other brand names, product names, or trademarks belong to their respective holders and are hereby acknowledged.