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XR21B1424 - Enhanced 4-Ch Full-Speed USB UART

Datasheet Summary

Description

The XR21B1424 is an enhanced Universal Asynchronous Receiver and Transmitter (UART) bridge to USB interface.

The USB interface is fully compliant to the USB 2.0 (Full-Speed) specification with 12 Mbps USB data transfer rate.

Features

  • ±15kV ESD on USBD+/USBD.
  • USB 2.0 Compliant, Full-Speed (12Mbps).
  • Unique pre-programmed USB serial number.
  • Internally generated 48MHz core clock.
  • Enhanced UART features.
  • Baud rates up to 12 Mbps.
  • Fractional Baud Rate Generator.
  • 512-byte TX and 512-byte RX FIFOs.
  • Auto Hardware / Software Flow Control.
  • Multidrop and Half-Duplex Modes.
  • Auto RS-485 Half-Duplex Control.
  • Selectable GPIO or Modem.

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Datasheet preview – XR21B1424

Datasheet Details

Part number XR21B1424
Manufacturer Exar
File Size 438.99 KB
Description Enhanced 4-Ch Full-Speed USB UART
Datasheet download datasheet XR21B1424 Datasheet
Additional preview pages of the XR21B1424 datasheet.

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Full PDF Text Transcription

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XR21B1424 Enhanced 4-Ch Full-Speed USB UART General Description The XR21B1424 is an enhanced Universal Asynchronous Receiver and Transmitter (UART) bridge to USB interface. The USB interface is fully compliant to the USB 2.0 (Full-Speed) specification with 12 Mbps USB data transfer rate. The USB interface also supports USB suspend, resume and remote wakeup operations. The USB Vendor ID, Product ID, power mode, remote wakeup support, maximum power, and numerous other settings may be programmed in the on-chip OTP memory via the USB interface. The XR21B1424 includes an internal oscillator and does not require an external crystal/oscillator. Any UART baud rate up to 12 Mbps may be generated with this internal clock and the fractional baud rate generator.
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