XR21B1411IL16MTR-F

Overview

The XR21B1411IL16MTR-F is an enhanced single-channel Universal Asynchronous Receiver and Transmitter with a USB interface, compliant with the Full-Speed USB 2.0 specification supporting a 12 Mbps data transfer rate. It operates from a single 5V supply (VCC: 4.4V–5.25V) and features a 1.6V–3.6V I/O reference voltage (VIO_REF). The device integrates a programmable internal oscillator operating at 6, 12, 24, or 48 MHz, eliminating the need for external crystals. It includes a 128-byte transmit FIFO and a 384-byte receive FIFO, enabling baud rates up to 12 Mbps via a fractional baud rate generator. The component is housed in a 16-pin QFN package and supports USB suspend, resume, and remote wakeup operations.

Feature Summary

• Integrated programmable internal clock eliminates requirement for external crystal oscillators
• Automatic RS-485 half-duplex transceiver direction control simplifies hardware design
• Supports multidrop mode with automatic address matching for network applications
• On-board one-time programmable memory allows customization of USB identifiers and default settings

Applications

• Portable appliances requiring serial connectivity
• External USB-to-serial converters and dongles
• Battery-operated devices utilizing bus-powered modes
• Cellular data devices and industrial automation controls

Procurement Notes

Verify that the ordering suffix matches the required packaging method, as the IL16 variant is available in both tray and tape-and-reel formats. Confirm the specific revision level against the manufacturer's latest documentation to ensure compatibility with existing firmware drivers. Check environmental ratings and lead-free status if required by assembly specifications. Ensure the selected part number corresponds to the desired operating temperature range of -40°C to +85°C.

Selection Notes

Select this component when a USB 2.0 Full-Speed interface is required without external clocking components. The large RX FIFO size benefits high-throughput applications, while the auto RS-485 control reduces peripheral count in industrial networks. Consider the OTP programming capabilities if unique Vendor IDs or Product IDs are necessary for system integration. Verify that the host system supports the required Windows or Linux virtual COM port drivers.

Part Context

This part belongs to the MaxLinear XR21B1411 family of enhanced USB UARTs. It serves as a direct replacement for previous generation UARTs that required external crystals, offering improved integration and reduced board space. The IL16 designation indicates the 16-pin QFN package form factor, distinguishing it from other pin-count variants within the broader product line.

Replacement Considerations

The XR21B1411IL16-F is the tray-packaged equivalent of the TR-F reel version. Both share identical electrical characteristics and functionality. Verify that any substitute maintains the same 16-pin QFN footprint and thermal pad requirements for proper PCB mounting and heat dissipation.