XR21B1424IV64TR-F

Overview

The XR21B1424IV64TR-F is a quad-channel Full-Speed USB to UART bridge integrated circuit manufactured by MaxLinear. It operates within the XR21B1424 series and supports USB 2.0 compliance with data rates up to 12 Mb/s. The device features 512-byte transmit and receive FIFOs for each of its four channels. It functions on dual power supplies: a core voltage ranging from 3 V to 3.6 V and an I/O voltage ranging from 4.4 V to 5.25 V, with a typical operating current of 15 mA. The component is housed in a 64-pin LQFP package designed for surface mount technology and supports an industrial temperature range from -40°C to +85°C.

Feature Summary

• Provides four independent UART channels bridged to a single USB interface
• Integrates dedicated 512-byte TX and RX FIFOs per channel to manage data flow
• Supports standard USB suspend, resume, and remote wakeup operations

Applications

• Industrial automation systems requiring multiple serial connections
• Embedded devices needing expansion of UART ports via USB
• Test and measurement equipment interfaces

Procurement Notes

Verify the specific suffix TR-F indicates reel packaging when sourcing. Confirm that the design accommodates the distinct dual-voltage requirements for core and I/O domains. Ensure ESD protection measures are implemented during handling due to moisture sensitivity classification. Cross-reference the exact pinout against the official datasheet for the LQFP-64 package before finalizing PCB layout.

Selection Notes

Select this component when four simultaneous UART connections are required over a single USB link. Compare against single-channel variants like the XR21B1411 if fewer ports suffice. Verify that the host system supports USB Full Speed rather than High Speed. Ensure the application environment stays within the specified -40°C to +85°C operational limits.

Part Context

This part belongs to the XR21B1424 family of USB-to-UART bridges. It shares architectural similarities with other members like the XR21B1422 but offers four channels instead of two. The IV64 designation specifies the lead-free, tape-and-reel version in the LQFP-64 package. It serves as a direct replacement for legacy multi-port UART controllers in space-constrained designs.

Replacement Considerations

The XR21B1424IV64-F is the tray-packaged equivalent of this reel-delivered component. For applications requiring fewer channels, the XR21B1422 series offers a compatible alternative with reduced port count.