Texas Instruments TUSB7340RKMT

Overview

TUSB7340RKMT from Texas Instruments is a USB 3.0-compliant xHCI host controller IC designed for PCIe Gen2-based host systems. It provides four independent SuperSpeed USB 3.0 downstream ports with per-port power control, overcurrent detection, and configurable transmit swing/de-emphasis. It operates with 1.1V core and 3.3V I/O supplies, supports internal spread-spectrum clocking, and targets server-class USB expansion in rack/microserver platforms.

For engineers reviewing the TUSB7340RKMT datasheet, TUSB7340RKMT pinout, TUSB7340RKMT application, or TUSB7340RKMT equivalent, this page delivers verified technical context, real-world port-level configuration capabilities, thermal and power specifications under active load, and validated alternative host controllers for PCIe-to-USB 3.0 bridge designs.

Technical Context

The TUSB7340RKMT implements an xHCI-compliant host controller architecture with a PCIe x1 Gen2 interface (5 GT/s), enabling full USB 3.0 protocol stack offload from the CPU. Its PHY layer includes independently programmable transmitter swing (16 settings, 2.7–1253 mVpp AC-coupled) and de-emphasis (16 levels, 0–69.3% amplitude reduction) per downstream port.

Each of its four USB ports integrates adaptive receiver equalization with five operating modes (flat, fully adaptive FTC normal/reversed, hold, initialize), plus dedicated PWRON#/OVERCUR# signals and dual-speed (HS/FS/LS) backward compatibility alongside SuperSpeed operation. The device requires no external flash for boot, using internal ROM for default xHCI initialization.

Key Specifications

Pinout & Package

Package: 100-pin WQFN-MR (RKM) with exposed thermal pad (VSS), 0.5 mm pitch, 9 mm × 9 mm body size. Thermal pad must be soldered to PCB ground plane for optimal junction-to-board conduction (RθJB = 15.2°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ASM1083 and VL805-Q4, the TUSB7340RKMT delivers integrated xHCI + PHY in one package, lower active power (1303.5 mW vs. 1450 mW), and field-tunable signal integrity per port-enabling robust USB 3.0 link establishment across variable trace lengths and connector losses without layout respins.

Availability

TUSB7340RKMT is available at Aetrix Electronics and suitable for rack server expansion, SAN HBA development, and industrial embedded host interface applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TUSB7340RKMT 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 over 50 years of innovation in interface and system-on-chip technologies.

The TUSB73x0 product line was engineered specifically for PCIe-based USB 3.0 host expansion in space-constrained, thermally demanding server and storage applications-delivering full xHCI compliance with minimal external components.

FAQ

What is the PCIe interface specification supported by the TUSB7340RKMT?

The TUSB7340RKMT implements a PCIe x1 Gen2 interface compliant with the PCI Express Base Specification Revision 2.0, operating at 5 GT/s with full MSI-X interrupt support. It uses differential PCIE_TXP/PCIE_TXN and PCIE_RXP/PCIE_RXN signals and requires a 100 MHz differential reference clock (PCIE_REFCLKP/PCIE_REFCLKN). This interface enables low-latency communication with the host CPU while maintaining full xHCI register compatibility. The TUSB7340RKMT does not support PCIe Gen3 or wider link widths.

Does the TUSB7340RKMT require an external EEPROM for basic operation?

No, the TUSB7340RKMT does not require an external EEPROM for basic operation. It boots from internal ROM with default xHCI configuration, including port enumeration and standard USB descriptors. An optional serial EEPROM may be used only for custom vendor-specific configurations, such as modified port mapping, custom device strings, or non-default PHY tuning parameters. The TUSB7340RKMT functions fully without EEPROM in standard USB 3.0 host applications.

How many USB 3.0 downstream ports does the TUSB7340RKMT support, and are they electrically independent?

The TUSB7340RKMT supports exactly four USB 3.0 downstream ports (DN1–DN4), each with fully independent electrical interfaces. Each port has dedicated SuperSpeed TX/RX differential pairs, HS/FS/LS D+/D− lines, PWRON# and OVERCUR# signals, and individually configurable PHY settings-including transmit swing, de-emphasis, and adaptive equalizer mode. This independence allows mixed-speed attachment (e.g., two SS devices + two HS devices) and per-port power gating without affecting other ports.

What thermal management provisions are specified for the TUSB7340RKMT in its RKM package?

The TUSB7340RKMT in its 100-pin WQFN-MR (RKM) package specifies RθJA = 25.6°C/W and RθJC(bot) = 0.4°C/W. The exposed thermal pad (VSS) must be soldered to a solid PCB ground plane to achieve rated thermal performance. Junction temperature is rated up to 105°C, with recommended operating ambient of 0°C to 85°C. Thermal design must account for peak power dissipation of 1303.5 mW during full 4-port SuperSpeed operation, and the device includes thermal shutdown protection per TI specifications.

Can the TUSB7340RKMT operate with a single-ended 48 MHz clock instead of a crystal?

Yes, the TUSB7340RKMT supports both crystal and single-ended oscillator inputs. When using a 48 MHz oscillator, it connects to the XI pin (A23), with XO (A22) left unconnected. The FREQSEL pin (B14) must be held low to configure the internal PLL for 48 MHz input. A 2 MΩ feedback resistor between XI and XO is required only when using a crystal; it is omitted with oscillator input. GRST# must remain asserted until the 48 MHz clock is stable before release.