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Manufacturer Part #


XR21V1412 Series 12 Mbps 3.3 V 2-Channel Full-Speed USB UART - QFN-32

Mfr. Name: MaxLinear
Standard Pkg:
Date Code: 1846
Product Specification Section
Technical Attributes
Attributes Table
Data Rate: 12Mbps
No of Functions / Channels: 2
Interface Circuit Type: USB
Supply Voltage-Nom: 2.97V to 3.63V
Supply Current: 16mA
Clock Frequency-Max: 48MHz
Operating Temperature: -40°C to +85°C
Package Style:  QFN-32
Mounting Method: Surface Mount
Features & Applications

The XR21V1412 (V1412) is an enhanced 2-channel Universal Asynchronous Receiver and Transmitter (UART) with a USB interface. The USB interface is fully compliant to Full Speed USB 2.0 specification that supports 12 Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup operations.

The V1412 operates from an internal 48MHz clock therefore no external crystal/oscillator is required like previous generation UARTs. With the fractional baud rate generator, any baud rate can accurately be generated using the internal 48 MHz clock. The V1412 operates from a single 2.97 to 3.63 volt power supply and has 5 V tolerant inputs. The V1412 is available in a 32-pin QFN package. Software drivers for Windows 2000, XP, Vista, and CE, as well as Linux and Mac are supported for the XR21V1412.


  • USB 2.0 Compliant Interface
    • Supports 12 Mbps USB full-speed data rate
    • Supports USB suspend, resume and remote wakeup operations
  • Enhanced UART Features
    • Data rates up to 12 Mbps
    • Fractional Baud Rate Generator
    • 128 byte TX FIFO
    • 384 byte RX FIFO
    • 7, 8 or 9 data bits, 1 or 2 stop bits
    • Automatic Hardware (RTS/CTS or DTR/DSR) Flow Control
    • Automatic Software (Xon/Xoff) Flow Control
    • Multidrop mode w/ Auto Half-Duplex Transceiver Control
    • Multidrop mode w/ Auto TX Enable
    • Half-Duplex mode
    • Sleep Mode with Remote Wake-up
    • Selectable GPIO or Modem I/O
  • Internal 48 MHz clock
  • Single 2.97-3.63 V power supply
  • 5V tolerant inputs
  • 16-pin QFN package
  • Virtual COM Port drivers
    • Windows 2000, XP and Vista
  • mWindows CE 4.2, 5.0, 6.0
    • Linux
  • Mac


  • Portable Appliances
  • External Converters (dongles)
  • Battery-Operated Devices
  • Cellular Data Devices
  • Factory Automation and Process Controls
  • Industrial applications



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