XR21B1421IL28-F

Overview

The XR21B1421IL28-F is a single-channel full-speed USB to UART bridge integrated circuit manufactured by MaxLinear. It complies with the USB 2.0 specification and operates at data rates up to 12 Mb/s. The device integrates 512-byte transmit and receive FIFOs to facilitate efficient data buffering. It supports operation within a supply voltage range of 3.0 V to 3.6 V for the core logic and 4.4 V to 5.25 V for I/O interfaces, drawing approximately 15 mA of operating current. The component is housed in a 28-pin QFN package and is rated for an industrial temperature range from -40°C to +85°C.

Feature Summary

• Integrates a complete USB 2.0 full-speed interface with a dedicated UART controller
• Includes built-in 512-byte TX and RX FIFOs for enhanced data throughput management
• Supports Human Interface Device (HID) class protocols for driver-free operation on compatible host systems

Applications

• Industrial automation systems requiring serial communication over USB
• Medical equipment needing reliable serial data transfer without external drivers
• Point-of-sale terminals utilizing HID-compatible USB connectivity
• Embedded control modules interfacing legacy UART peripherals via USB

Procurement Notes

Verify the specific suffix 'F' against the manufacturer's official documentation to confirm lead time and environmental compliance status. Ensure that the 28-lead QFN package dimensions align with the target PCB footprint. Confirm that the required supply voltages match the system design constraints before finalizing procurement orders.

Selection Notes

Select this component when a single UART channel with high-capacity FIFO buffering is required. It is suitable for applications demanding USB 2.0 full-speed connectivity with HID compatibility. Consider alternative models if multiple UART ports or higher speed interfaces are necessary. Verify that the thermal performance of the QFN package meets the enclosure requirements.

Part Context

This part belongs to the XR21B14xx series of USB to UART bridges from MaxLinear. It serves as a direct replacement for older EXAR-branded components in existing designs. The series is characterized by its ability to emulate standard COM ports while offering advanced flow control and baud rate generation capabilities for diverse serial devices.

Replacement Considerations

Check for pin-to-pin compatible alternatives within the same MaxLinear family, such as the XR21B1411 for single-channel needs or the XR21B1422 for dual-channel requirements. Ensure that any substitute maintains the same package type and electrical specifications to avoid redesigning the host board.