XR21B1421IL28TR-F

Overview

The XR21B1421IL28TR-F is a single-channel Full Speed USB to UART bridge integrated circuit manufactured by MaxLinear. It operates within a supply voltage range of 3.0 V to 5.25 V and draws a maximum operating current of 15 mA. The device supports data rates up to 12 Mb/s and includes 512-byte transmit and receive FIFOs for efficient data buffering. It is housed in a 28-lead QFN package with dimensions of 4 mm x 4 mm x 0.9 mm. The component functions across an industrial temperature range from -40°C to +85°C and complies with USB 2.0 standards.

Feature Summary

• Integrates a full-speed USB 2.0 interface with a universal asynchronous receiver/transmitter (UART) bridge
• Provides 512-byte dedicated transmit and receive FIFO buffers to minimize host CPU intervention
• Supports standard RS-232 signal levels including RTS, CTS, DSR, DCD, RI, and DTR via GPIO configuration
• Enables flexible baud rate generation through programmable dividers supporting high-speed communication

Applications

• Industrial automation systems requiring serial-to-USB connectivity
• Embedded devices needing low-power USB enumeration without external drivers
• Point-of-sale terminals and kiosks utilizing HID-compliant UART bridges
• Medical equipment interfaces requiring reliable serial data transmission

Procurement Notes

Verify the specific suffix 'IL28' confirms the 28-lead QFN package variant during sourcing. Confirm RoHS compliance status as indicated in official datasheets. Check for lead-free manufacturing certifications required by target market regulations. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component when a single-port USB-to-UART solution with built-in FIFOs is required. Compare against other MaxLinear series such as the XR21B1411 or XR21V1414 based on pin count and interface requirements. Evaluate power consumption constraints against the 15 mA typical operating current. Consider package availability and thermal performance for dense PCB layouts.

Part Context

This part belongs to the XR21B14xx series of USB-to-UART bridge controllers designed for embedded applications. It complements higher-density models like the XR21B1424 while offering a compact footprint compared to legacy solutions. The series emphasizes driverless operation through USB Human Interface Device (HID) class compatibility.

Replacement Considerations

Direct substitutes include the XR21B1421IV28 variant if different temperature grading is needed. Cross-reference with XR21B1411 for single-channel alternatives with different packaging. Verify functional equivalence with XR21V141x series if voltage levels differ significantly.