Texas Instruments TUSB8043ARGCT

Overview

TUSB8043ARGCT from Texas Instruments is a four-port USB 3.2 x1 Gen1 (5 Gbps) hub IC with integrated USB 2.0 Multi-Transaction Translator (MTT), internal HID-to-I2C downstream port, and battery charging support (CDP/DCP/ACP modes per port). It operates with 1.1-V and 3.3-V supplies, uses a single 24-MHz crystal, and is housed in a 64-pin VQFN (RGC) package for docking stations and embedded host systems.

For engineers reviewing the TUSB8043ARGCT datasheet, TUSB8043ARGCT pinout, TUSB8043ARGCT application, or TUSB8043ARGCT equivalent, key selection considerations include SuperSpeed + high-speed concurrent upstream operation, per-port/ganged power switching with over-current detection, I2C/SMBus programmability for VID/PID/custom strings, and USB HID-to-I2C bridge functionality supporting high-speed/full-speed operation.

Technical Context

The TUSB8043ARGCT implements a full-featured USB 3.2 x1 Gen1 hub architecture with independent SuperSpeed (5 Gbps) and USB 2.0 (480 Mbps) data paths. Its MTT design provides four transaction translators and two asynchronous endpoint buffers per translator to reduce latency and improve bandwidth utilization across mixed-speed downstream devices.

It supports dynamic speed negotiation: when the upstream port connects only to USB 2.0 hosts, SuperSpeed and high-speed links are disabled on downstream ports. The internal USB 2.0-only downstream port enables HID-to-I2C bridging at speeds matching the upstream link-up to high-speed (480 Mbps)-and supports vendor requests for EEPROM/I2C read/write at 100 kHz or 400 kHz.

Key Specifications

Pinout & Package

Package: 64-pin VQFN (RGC), 9.0 mm × 9.0 mm body size, exposed thermal pad (VSS) requiring PCB ground connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 3.x hub applications.

Compared with USB2514B-AEZG, TUSB8043ARGCT adds 5-Gbps bandwidth, battery charging compliance, and embedded I2C control-justifying its use in performance-critical docking and embedded host applications. Against TUSB8041ARGCT, it doubles downstream capacity at modest increases in current draw and board area, making it optimal for multi-peripheral aggregation.

Availability

TUSB8043ARGCT is available at Aetrix Electronics and suitable for computer docking stations, industrial monitors, set-top boxes, and embedded automotive infotainment systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TUSB8043ARGCT 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 USB interface ICs and industrial-grade signal chain products.

The TUSB8043ARGCT belongs to TI's USB 3.x Hub family, designed specifically for high-reliability embedded host systems requiring concurrent SuperSpeed and USB 2.0 connectivity, intelligent power management, and seamless integration of I2C peripherals via HID-class drivers.

FAQ

What is the primary function of the TUSB8043ARGCT in a USB system architecture?

The TUSB8043ARGCT serves as a four-port USB 3.2 x1 Gen1 hub controller that enables simultaneous SuperSpeed (5 Gbps) and USB 2.0 (480 Mbps) data transfer between a host and multiple downstream devices. It integrates a Multi-Transaction Translator (MTT), per-port power switching, battery charging logic (CDP/DCP/ACP), and an internal HID-to-I2C bridge-making it ideal for docking stations and embedded hosts where compactness, power efficiency, and protocol flexibility are critical. The TUSB8043ARGCT handles enumeration, link training, and traffic arbitration without external microcontroller intervention.

Does the TUSB8043ARGCT support USB Battery Charging Specification v1.2 compliance?

Yes, the TUSB8043ARGCT supports USB Battery Charging Specification v1.2 through hardware-enforced CDP (Charging Downstream Port) mode when the upstream port is connected, and DCP (Dedicated Charging Port) mode-including compliance with Chinese Telecommunications Industry Standard YD/T 1591-2009-when the upstream port is unconnected. It also implements ACP1–ACP3 divider-based charging modes and automatic transition sequencing among them. These capabilities are implemented in silicon and do not require firmware configuration, ensuring deterministic behavior across power states and host enumeration sequences.

Can the internal HID-to-I2C port of the TUSB8043ARGCT operate independently of the upstream USB connection?

No, the internal HID-to-I2C port of the TUSB8043ARGCT operates only when the upstream port is active and enumerated. Its speed matches the upstream link-supporting high-speed (480 Mbps) or full-speed (12 Mbps) operation-but it does not function in isolation. The HID-to-I2C bridge relies on the upstream USB host to issue vendor-specific requests for I2C read/write operations and EEPROM programming. When the upstream port is disconnected or suspended, the internal port remains inactive, and no I2C transactions can be initiated or completed.

What clock source options are supported by the TUSB8043ARGCT, and are external components required?

The TUSB8043ARGCT supports a single 24-MHz clock source via either a parallel-mode crystal connected between XI and XO pins-or a 24-MHz CMOS oscillator driving the XI pin directly. When using a crystal, a 1-MΩ feedback resistor must be placed between XI and XO per TI's layout guidelines. No PLL or frequency multiplication is performed internally; the 24-MHz reference clocks all USB PHYs and digital logic blocks. External clock sources must meet ±100 ppm stability over temperature and voltage to ensure USB specification compliance.

How does the TUSB8043ARGCT handle over-current protection across its four downstream ports?

The TUSB8043ARGCT supports both per-port and ganged over-current detection via dedicated OVERCUR1z–OVERCUR4z inputs. Each is an active-low, open-drain signal tied to the fault output of an external power switch. In per-port mode, only the affected port loses power during an over-current event; in ganged mode, all ports are shut down simultaneously. The mode is selected at reset via the GANGED/SMBA2/HS_UP pin. The TUSB8043ARGCT does not include internal current-sensing circuitry-it relies entirely on external switches and these digital fault inputs to enforce protection, ensuring design flexibility and compliance with USB power delivery safety requirements.