XR21B1420IL28-F

Overview

The XR21B1420IL28-F is a single-channel Full-Speed USB to UART bridge integrated circuit manufactured by MaxLinear. It operates under the USB 2.0 standard with a data rate of 12 Mb/s. The device supports power supply voltages ranging from 3 V to 3.6 V and 4.4 V to 5.25 V, with a typical operating current of 15 mA. It features 512-byte transmit and receive FIFOs and is housed in a QFN-28 surface-mount package. The component functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrates a full-speed USB interface with a universal asynchronous receiver/transmitter bridge for serial communication conversion.
• Includes dedicated 512-byte transmit and receive first-in-first-out buffers to manage data flow efficiently.
• Supports flexible power supply configurations compatible with both 3.3 V and 5 V system rails.

Applications

• Converting legacy RS-232 or RS-485 serial devices to modern USB host connections.
• Providing serial connectivity in embedded systems requiring USB enumeration without external microcontrollers.
• Industrial automation equipment needing robust serial-to-USB bridging in harsh environments.

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure compatibility with the target system's voltage levels before procurement. Confirm availability through authorized distributors as lead times may vary based on production schedules.

Selection Notes

Select this component when a single UART channel with high-capacity buffering is required for USB connectivity. Compare against the XR21B1411 series if lower power consumption is critical, or the XR21B1422 series if multiple channels are needed. Verify that the QFN-28 package fits the available PCB footprint constraints.

Part Context

This part belongs to the XR21B14xx enhanced full-speed USB UART family from MaxLinear. It serves as a drop-in replacement for older USB-to-serial controllers, offering improved performance and larger FIFO depths compared to legacy solutions like the FT232R.

Replacement Considerations

Direct pin-compatible alternatives within the same family include the XR21B1420IL28TR-F (tape and reel) or the XR21B1421IL28-F (HID-enabled variant). Cross-family replacements require schematic review due to potential pinout differences.