XR21B1411IL16TR-F

Overview

The XR21B1411IL16TR-F is a single-channel Full-Speed USB to UART bridge IC from MaxLinear. It operates on a single 5V supply (4.4V–5.25V) with a maximum operating current of 11 mA. The device supports data rates up to 12 Mbps and features a 128-byte transmit FIFO and a 384-byte receive FIFO. It utilizes an internal programmable oscillator capable of generating clock frequencies of 6, 12, 24, or 48 MHz, eliminating the need for external crystals. The component is housed in a 16-pin QFN package and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates an internal programmable oscillator supporting 6 MHz to 48 MHz operation without external components
• Includes automatic hardware flow control via RTS/CTS or DTR/DSR signals and software XON/XOFF support
• Provides auto RS-485 half-duplex transceiver direction control to simplify multidrop network designs
• Supports remote wakeup functionality through GPIO0/RI# pin to exit USB suspend state

Applications

• Portable appliances requiring compact USB connectivity
• External USB-to-UART converter dongles
• Battery-operated devices utilizing bus-powered modes
• Cellular data communication modules
• Factory automation and industrial process control systems

Procurement Notes

Verify the specific ordering suffix TR-F confirms tape and reel packaging rather than tray format. Confirm that the IL designation corresponds to the industrial temperature range of -40°C to +85°C. Ensure compatibility with required Windows WHQL or Linux drivers if standard CDC-ACM usage is intended. Check OTP programming requirements if custom Vendor or Product IDs are necessary for the application.

Selection Notes

Select this component when a single UART channel with high throughput is required in a minimal footprint. The integrated oscillator reduces bill-of-materials complexity compared to previous generations requiring external crystals. Consider the 384-byte RX FIFO size for applications needing reduced host polling frequency. Verify that the 5V-only power supply constraint aligns with the system design, as VIO_REF requires a separate 1.6V to 3.6V level translation supply.

Part Context

This part belongs to the XR21B1411 series of enhanced USB UART controllers. It serves as a successor to earlier EXAR UART generations by removing the need for external oscillators. The IL16 variant specifically denotes the 16-pin QFN package configuration. It shares functional similarities with other members of the family but differs in channel count and package options found in models like the XR21B1422 or XR21V1414.

Replacement Considerations

Direct replacements within the same series include the XR21B1411IL16-F, which offers identical electrical characteristics but utilizes tray packaging instead of tape and reel.