USB5434B-JZXTR

Controllers Overview

The USB5434B-JZXTR is a 4-port SuperSpeed/Hi-Speed hub controller compliant with the USB 3.0 specification. It supports data rates of 5 Gbps (SuperSpeed), 480 Mbps (Hi-Speed), 12 Mbps (Full-Speed), and 1.5 Mbps (Low-Speed). The device operates on dual power supplies: VDD12 at 1.25 V and VDD33 at 3.3 V. It utilizes a single 25 MHz crystal or clock input for all internal PLL and clocking requirements. The component is housed in a 64-pin QFN package measuring 9 x 9 mm with a 6.0 mm exposed pad, designed for surface mount technology.

Controllers Feature Summary

• Features MultiTRAK technology with dedicated Transaction Translators for each port to maintain consistent Full-Speed throughput.
• Integrates all required series termination, pull-up, and pull-down resistors directly into the hub controller.
• Supports JTAG boundary scan testing and includes an IETF RFC 4122 compliant 128-bit UUID.

Controllers Applications

• Desktop and laptop computer expansion ports
• Industrial control systems requiring multiple peripheral connections
• Consumer electronics devices needing high-speed data transfer capabilities

Controllers Procurement Notes

Verify the specific suffix 'JZXTR' corresponds to the tape and reel packaging configuration containing 3000 pieces per reel. Confirm that the operating temperature range matches the application requirements, as the base model specifies 0°C to 70°C while the 'i' variant covers -40°C to 85°C. Ensure compatibility with the host system's power delivery specifications for both 1.25 V and 3.3 V rails before finalizing orders.

Controllers Selection Notes

Select this component when a low-power, configurable hub controller is required for USB 3.0 applications. The integrated resistor network simplifies PCB layout by eliminating external passive components for standard USB signaling. Consider the exposed pad thermal design carefully, as it serves as the primary conduction path for heat dissipation from the die to the motherboard ground plane.

Controllers Part Context

This part belongs to the SMSC USB5434B family of hub controllers, which are now managed under Microchip Technology following their acquisition of Standard Microsystems Corporation. The family provides a unified solution for managing legacy USB 2.0 traffic alongside new SuperSpeed transfers without performance degradation between the two protocols.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Designers should consult official Microchip resources for potential obsolescence management or pin-compatible alternatives within the broader USB interface portfolio.

Controllers FAQ

How does the USB5434B handle simultaneous SuperSpeed and USB 2.0 traffic?

The SuperSpeed hub controller operates in parallel with the USB 2.0 hub controller, ensuring that 5 Gbps SuperSpeed data transfers remain unaffected by slower USB 2.0 traffic.

What is the function of the exposed pad on the QFN-64 package?

The exposed pad is the device's only connection to VSS (ground) and serves as the primary thermal conduction path. It must be connected to an appropriate via field on the PCB.

Can the USB5434B operate without an external crystal?

Yes, the XTALIN/CLK_IN pin can accept an external 25 MHz clock signal. In this configuration, the XTALOUT pin becomes a no-connect.