Texas Instruments TUSB7320RKMT

Overview

TUSB7320RKMT from Texas Instruments is a USB 3.0-compliant xHCI host controller IC implementing PCIe x1 Gen2 host interface and supporting exactly two downstream SuperSpeed USB ports with independent power control, overcurrent detection, and configurable transmit swing/de-emphasis. It integrates internal spread-spectrum clock generation, requires no external flash for default operation, and targets embedded server and storage host bus adapter applications.

For engineers reviewing the TUSB7320RKMT datasheet, TUSB7320RKMT pinout, TUSB7320RKMT application, or TUSB7320RKMT equivalent, key selection factors include PCIe Gen2 compatibility, dual-port USB 3.0 host capability, WQFN-MR 100-pin thermal pad package, 1.1V core/3.3V I/O supply requirements, and adaptive receiver equalization for signal integrity on lossy PCB traces.

Technical Context

The TUSB7320RKMT implements the xHCI 1.0 specification and interfaces to the host CPU via a PCIe x1 Gen2 (5 GT/s) link, using differential reference clock inputs (PCIE_REFCLKP/N) and PERST#/GRST# reset hierarchy. Its dual-port USB PHY supports simultaneous SuperSpeed (5 Gbps), high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) device connections.

Each downstream port features independent enable/disable control, per-port power switching (PWRON1#/PWRON2#), overcurrent sensing (OVERCUR1#/OVERCUR2#), and programmable transmitter equalization (SWING/DE-EMPHASIS bits) plus adaptive receiver equalization (Portx_EQ register) to compensate for channel insertion loss up to 20 dB at 2.5 GHz.

Key Specifications

Pinout & Package

Package: 100-pin WQFN-MR (RKM), 9 mm × 9 mm, 0.5 mm pitch, exposed thermal pad (VSS). Designed for low-inductance grounding and thermal dissipation in dense server motherboard layouts.

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, TUSB7320RKMT offers tighter integration (no external clock IC needed) and lower thermal footprint in 100-pin WQFN-MR, while ASM1083 lacks USB 3.0 capability entirely-making TUSB7320RKMT the sole viable choice for new dual-port SuperSpeed host designs requiring PCIe Gen2 efficiency and xHCI compliance.

Availability

TUSB7320RKMT is available at Aetrix Electronics and suitable for rack server motherboards, storage area network HBAs, and industrial embedded host systems requiring stable component supply, long lifecycle support, and qualified USB 3.0 xHCI compliance.

Supply support for TUSB7320RKMT 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 solutions with leadership in industrial, automotive, and communications markets.

The TUSB73x0 product line delivers USB 3.0 xHCI host controllers optimized for server, storage, and embedded computing platforms requiring PCIe Gen2 integration, low-power idle states, and robust signal integrity across extended PCB traces.

FAQ

What is the maximum number of USB 3.0 devices supported by the TUSB7320RKMT?

The TUSB7320RKMT supports exactly two downstream USB 3.0 ports, each capable of connecting one SuperSpeed device or a USB hub. It does not support more than two concurrent SuperSpeed links. The TUSB7320RKMT datasheet confirms dual-port operation, distinguishing it from the 4-port TUSB7340 variant. Each port operates independently with full xHCI-defined power management and link training capabilities.

Does the TUSB7320RKMT require an external crystal or oscillator?

Yes, the TUSB7320RKMT requires either a 25 MHz crystal (connected between XI and XO pins with 2 MΩ feedback resistor) or a 48 MHz single-ended oscillator (driving XI only). The FREQSEL pin must be strapped low for both configurations. The TUSB7320RKMT integrates spread-spectrum clock generation but relies on this external timing source for USB and PCIe clock domain derivation.

What thermal management provisions does the TUSB7320RKMT package include?

The TUSB7320RKMT uses a 100-pin WQFN-MR (RKM) package with an exposed thermal pad (VSS) on the bottom surface. Its RθJC(bot) is 0.4 °C/W, enabling efficient conduction cooling into the PCB ground plane. Thermal design must include ≥6 thermal vias under the pad connected to an internal ground plane, per TI's SLLSE76R datasheet Section 7.4. The RθJA of 25.6 °C/W assumes standard JEDEC 2S2P test board conditions.

Can the TUSB7320RKMT operate with a 1.05 V core supply voltage?

Yes, the TUSB7320RKMT is specified to operate with a 1.05 V core supply (VDD11) within ±5% tolerance (1.045–1.155 V), as confirmed in Section 5.3 Recommended Operating Conditions. Power consumption tables list 1.05 V as the nominal core voltage, and the device draws 594 mA in active state with two SuperSpeed devices connected. Deviations beyond ±5% risk functional failure or reduced reliability.

How does the TUSB7320RKMT handle USB device overcurrent detection?

The TUSB7320RKMT provides dedicated open-drain, active-low overcurrent sense inputs (OVERCUR1# and OVERCUR2#) for each downstream port. These pins monitor external current-limiting circuits (e.g., TPS2061) and assert logic '0' when overcurrent is detected. The TUSB7320RKMT responds by disabling the affected port's power switch (PWRON1#/PWRON2#) and reporting the fault via xHCI operational registers-enabling automatic recovery or OS-level error handling without hardware reset.