Texas Instruments TUSB7320IRKMR

Overview

TUSB7320IRKMR from Texas Instruments is a USB 3.0-compliant xHCI host controller IC that implements a PCIe x1 Gen2 interface and provides two downstream USB ports supporting SuperSpeed (5 Gbps), high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) operation. It integrates adaptive receiver equalization, independent per-port power control and overcurrent detection, and internal spread-spectrum clock generation. It is used in desktop motherboards and embedded host systems requiring compact, low-power USB 3.0 expansion.

For engineers reviewing the TUSB7320IRKMR datasheet, TUSB7320IRKMR pinout, TUSB7320IRKMR application, or TUSB7320IRKMR equivalent, key selection criteria include PCIe Gen2 compatibility, dual-port USB 3.0 support with independent port enable/disable, integrated 1.1V core/3.3V I/O power domains, WQFN-MR 100-pin thermal pad package, and absence of external flash requirement for default configuration.

Technical Context

The TUSB7320IRKMR implements the xHCI 1.0 specification and interfaces with the host CPU via a PCIe x1 Gen2 (5 GT/s) link using differential REFCLK, TX/RX pairs, and PERST#/GRST# reset hierarchy. Its PHY layer supports per-port transmit swing (16 settings), de-emphasis (16 levels), and adaptive equalization with FTC-reversed mode as default for robust signal integrity across lossy PCB traces.

It operates with 1.1V core (VDD11), 3.3V analog (VDDA_3P3), and 3.3V I/O (VDD33) supplies, and includes dedicated pins for USB_SSTXP/SSTXN/SSRXP/SSRX on both downstream ports, plus PWRON#/OVERCUR# per port, JTAG debug, I²C configuration, and GPIOs - all mapped to a 100-pin WQFN-MR (RKM) exposed-pad package.

Key Specifications

Pinout & Package

Package: 100-pin WQFN-MR (RKM) with exposed thermal pad, 7 mm × 7 mm footprint, 0.4 mm pitch, designed for thermal performance in space-constrained host applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 3.0 host controller applications.

Compared with VL805-Q4 and uPD720202, the TUSB7320IRKMR offers lower idle power (71 mW), integrated crystal drive with internal feedback resistor, and no mandatory external flash - making it optimal for cost-sensitive, thermally constrained, and flash-free embedded host designs.

Availability

TUSB7320IRKMR is available at Aetrix Electronics and suitable for desktop motherboard expansion, rack server USB hub modules, and industrial embedded host applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TUSB7320IRKMR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies, with leadership in interface, power management, and signal chain solutions.

The TUSB73x0 product line delivers USB 3.0 xHCI host controllers optimized for PCIe-based host systems - targeting space-constrained, thermally sensitive, and flash-free embedded platforms requiring native SuperSpeed USB connectivity.

FAQ

What is the maximum data rate supported by the TUSB7320IRKMR?

The TUSB7320IRKMR supports SuperSpeed USB 3.0 operation at 5 Gbps per downstream port, compliant with the USB 3.0 specification and xHCI 1.0 architecture. It also maintains backward compatibility with high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) USB devices on the same ports. This capability is implemented in hardware and does not require firmware updates to enable.

Does the TUSB7320IRKMR require an external flash memory for operation?

No, the TUSB7320IRKMR does not require external flash memory for default operation. It contains internal non-volatile configuration storage enabling full xHCI functionality at power-on. An optional serial EEPROM may be added for custom vendor descriptors, device strings, or advanced port configuration - but this is not mandatory for basic USB 3.0 host operation.

What package type and thermal characteristics does the TUSB7320IRKMR use?

The TUSB7320IRKMR uses a 100-pin WQFN-MR (RKM) package with an exposed thermal pad, measuring 7 mm × 7 mm with 0.4 mm pitch. Its thermal metrics include RθJA = 25.6°C/W, RθJC(top) = 9.5°C/W, and RθJB = 15.2°C/W. These values are measured under JEDEC JESD51-2 conditions and support operation up to 105°C junction temperature with appropriate PCB copper pour and via stitching.

How does the TUSB7320IRKMR handle USB port power control and overcurrent protection?

The TUSB7320IRKMR provides dedicated PWRON# (active-low enable) and OVERCUR# (active-low fault flag) signals for each of its two downstream ports. PWRON# controls external power switches, while OVERCUR# asserts low upon detected overcurrent. Both signals are electrically isolated per port, allowing independent power management and fault containment - critical for reliable operation in multi-peripheral host systems.

Can the TUSB7320IRKMR operate with a crystal or an external oscillator?

Yes, the TUSB7320IRKMR supports both configurations. It accepts a 24 MHz fundamental-mode crystal between XI and XO pins (with internal 2 MΩ feedback resistor), or a 24 MHz CMOS/LVCMOS oscillator driving the XI pin only (XO left unconnected). The FREQSEL pin must be held low in either case. Crystal load capacitance range is 12–24 pF; oscillator output must meet 1.8V DC input specs per Section 5.7.