Texas Instruments TUSB2046BVFG4

Overview

TUSB2046BVFG4 from Texas Instruments is a 3.3-V, full-speed USB 2.0 hub IC with one upstream and four downstream ports, integrated transceivers, state-machine architecture (no firmware required), and support for both bus-powered and self-powered configurations. It enables compact 4-port USB hubs in peripherals like keyboards, printers, and docking stations.

For engineers reviewing the TUSB2046BVFG4 datasheet, TUSB2046BVFG4 pinout, TUSB2046BVFG4 application, or TUSB2046BVFG4 equivalent, key selection criteria include its LQFP-32 package, 6-MHz/48-MHz clock flexibility, ganged/per-port overcurrent management, EEPROM-programmable VID/PID, and industrial-grade thermal performance (RθJA = 35.7°C/W).

Technical Context

The TUSB2046BVFG4 implements USB 2.0 full-speed (12 Mbps) hub functionality via hardwired digital state machine logic-not a microcontroller-eliminating firmware development. Its integrated transceivers handle differential signaling on all five ports (DPx/DMx), with automatic slew-rate adaptation for low-speed (1.5 Mbps) and full-speed devices.

Power management is configurable via BUSPWR and EEDATA/GANGED pins to support four modes: bus-powered/ganged, bus-powered/per-port, self-powered/ganged, and self-powered/per-port. Clocking supports either a 6-MHz crystal (XTAL1/XTAL2) with internal PLL generating 48 MHz/12 MHz, or direct 48-MHz clock input via TSTPLL/48MCLK when TSTMODE = high.

Key Specifications

Pinout & Package

LQFP-32 package (JEDEC S-PQFP-G), 7.0 mm × 7.0 mm body, 0.8-mm lead pitch, exposed pad not present. Pin 1 marked by dot; top-side marking includes TI logo and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2046I, the TUSB2046BVFG4 trades extended temperature tolerance for lower unit cost and optimized commercial thermal performance; compared with UPD720114, it delivers superior ESD immunity, lower active current, and integrated crystal-based low-EMI clocking-making it preferred for cost-sensitive, EMI-constrained consumer peripherals.

Availability

TUSB2046BVFG4 is available at Aetrix Electronics and suitable for keyboard hubs, printer peripherals, docking stations, and monitor-integrated USB expansion requiring stable component supply and long-term production continuity.

Supply support for TUSB2046BVFG4 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 U.S.-based semiconductor company specializing in analog, embedded processing, and connectivity solutions, with decades of leadership in USB interface ICs and industrial-grade mixed-signal design.

The TUSB2046x product line delivers cost-optimized, firmware-free USB 2.0 hub ICs targeting commercial and industrial peripheral equipment where reliability, low EMI, and minimal bill-of-materials are critical design goals.

FAQ

What USB speed modes does the TUSB2046BVFG4 support?

The TUSB2046BVFG4 supports both full-speed (12 Mbps) and low-speed (1.5 Mbps) USB 2.0 operation on all four downstream ports. It automatically detects device speed and adjusts slew rate accordingly-no configuration required. The upstream port operates exclusively at full-speed to maintain compatibility with host controllers. This dual-speed capability ensures seamless interoperability with keyboards, mice, flash drives, and other common USB peripherals.

Does the TUSB2046BVFG4 require firmware or external microcontroller support?

No, the TUSB2046BVFG4 uses a dedicated digital state-machine architecture-not a programmable core-so it requires no firmware, bootloader, or external microcontroller. All USB protocol handling, port management, suspend/resume sequencing, and descriptor reporting are implemented in hardware. This eliminates firmware validation, flash programming steps, and associated supply-chain dependencies-making TUSB2046BVFG4 ideal for high-volume, cost-sensitive USB hub designs.

Can the TUSB2046BVFG4 operate with a 48-MHz clock instead of a crystal?

Yes, the TUSB2046BVFG4 supports direct 48-MHz clock input via the TSTPLL/48MCLK pin when TSTMODE is held high. In this mode, the internal oscillator and PLL are bypassed, reducing power and simplifying layout. However, a crystal cannot be used for 48-MHz operation-the internal oscillator only supports fundamental frequencies up to 6 MHz. For crystal-based designs, TUSB2046BVFG4 uses XTAL1/XTAL2 with internal PLL multiplication to generate required clocks.

How does overcurrent protection work on the TUSB2046BVFG4?

The TUSB2046BVFG4 provides configurable overcurrent protection via four OVRCUR inputs (active-low, noise-filtered) and corresponding PWRON outputs. When GANGED = high, any OVRCUR assertion disables all downstream ports simultaneously. When GANGED = low, each port operates independently. External power switches (e.g., TPS2044) drive the OVRCUR lines based on sensed current; TUSB2046BVFG4 then asserts PWRON to cut 5-V power-ensuring USB specification compliance and system-level fault isolation.

What is the purpose of the EXTMEM pin on the TUSB2046BVFG4?

EXTMEM is a mode-select pin that determines whether pins 5 (EECLK) and 6 (EEDATA/GANGED) function as an EEPROM interface or as hub control signals. When EXTMEM = high, EEDATA/GANGED acts solely as the ganged/per-port power management selector and EECLK is disabled. When EXTMEM = low, the EEPROM interface activates-allowing custom VID/PID loading from an external M93C46-compatible EEPROM-enabling branded device enumeration without modifying host driver stacks.