Texas Instruments TUSB2077APTG4

Overview

TUSB2077APTG4 from Texas Instruments is a 3.3-V, 7-port USB 2.0 full-speed hub IC with integrated transceivers, bus/self-powered mode selection (via BUSPWR), per-port or ganged overcurrent reporting (via OVRCUR1–OVRCUR7), and 48-pin LQFP packaging - deployed in computer docking stations, keyboard/printer-embedded hubs, and monitor-integrated USB expansion.

For engineers reviewing the TUSB2077APTG4 datasheet, TUSB2077APTG4 pinout, TUSB2077APTG4 application, or TUSB2077APTG4 equivalent, key selection considerations include its dual-clock support (6-MHz crystal or 48-MHz external clock), EEPROM-configurable VID/PID via EXTMEM-controlled interface, SUSPND-driven power-down capability, and push-pull PWRON outputs eliminating external pullups.

Technical Context

The TUSB2077APTG4 implements a hardware state-machine architecture - requiring no firmware or host-side driver customization - and integrates seven compliant USB 2.0 transceivers supporting both full-speed (12 Mb/s) and low-speed (1.5 Mb/s) downstream devices with automatic slew-rate adaptation. Its upstream port (DP0/DM0) connects to host controllers while downstream ports (DP1–DP7/DM1–DM7) drive peripherals.

Power management is hardware-configured: BUSPWR selects bus-powered (four ports max) or self-powered (seven ports) modes; EEDATA/GANGED and EXTMEM jointly enable ganged vs. per-port overcurrent handling and optional external EEPROM for custom VID/PID. Clocking flexibility includes MODE-selectable APLL-based 6-MHz crystal operation or direct 48-MHz clock bypass.

Key Specifications

Pinout & Package

Package: 48-pin LQFP (7.00 mm × 7.00 mm), JEDEC S−PQFP−G compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TUSB2077APTG4, TUSB2046BPT reduces port count and feature set for compact designs, while UPD720114GA adds charging support and dual-rail operation at the cost of external power regulation and loss of EEPROM-based VID/PID customization.

Availability

TUSB2077APTG4 is available at Aetrix Electronics and suitable for computer docking stations, monitor-integrated USB expansion, and peripheral-embedded hubs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TUSB2077APTG4 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 broad industrial, automotive, and computing applications.

The TUSB2077APTG4 belongs to TI's USB physical-layer and hub IC product line, designed specifically for cost-sensitive, firmware-free USB 2.0 expansion in consumer and commercial peripherals.

FAQ

What USB speed modes does the TUSB2077APTG4 support?

The TUSB2077APTG4 supports both full-speed (12 Mb/s) and low-speed (1.5 Mb/s) USB 2.0 operation on all downstream ports. It automatically detects device speed and adjusts slew rate accordingly - no configuration required. The upstream port (DP0/DM0) operates exclusively in full-speed mode per USB 2.0 hub specification. This behavior is inherent to the TUSB2077APTG4's integrated transceiver design and state-machine logic.

Does the TUSB2077APTG4 require an external microcontroller or firmware?

No, the TUSB2077APTG4 operates autonomously using a dedicated digital state-machine ASIC - no external microcontroller, firmware, or host-side driver modifications are needed. It enumerates as a standard USB hub under any OS with native USB stack support. All hub functions - including transaction translation, suspend/resume, port power control, and overcurrent response - are handled in hardware within the TUSB2077APTG4 itself.

How does the TUSB2077APTG4 handle overcurrent protection?

The TUSB2077APTG4 supports both ganged and per-port overcurrent detection via OVRCUR1–OVRCUR7 inputs. When an overcurrent event occurs, the corresponding PWRONx output is disabled, cutting power to that port (per-port mode) or all ports (ganged mode). External power switches (e.g., TPS2044) must be used - the TUSB2077APTG4 provides only the control logic and status reporting, not power switching FETs.

Can the TUSB2077APTG4 use a 48-MHz oscillator instead of a crystal?

Yes, the TUSB2077APTG4 accepts a 48-MHz clock directly on the XTAL1/CLK48 pin when MODE = high, bypassing the internal APLL and oscillator cell. However, this configuration disables true USB suspend/resume because the oscillator cannot be stopped while powered. For full suspend capability, a 6-MHz crystal (with XTAL2) is required - the TUSB2077APTG4's APLL generates the necessary 48-MHz internal clock dynamically.

What is the function of the DP0PUR pin on the TUSB2077APTG4?

The DP0PUR pin on the TUSB2077APTG4 is an open-drain output that disables the upstream DP0 pullup resistor for 15 ms after RESET assertion or any logic-level change on BUSPWR. This timing window enables clean dynamic switching between bus-powered and self-powered configurations without enumeration conflicts - a critical feature for adaptive power architectures implemented with the TUSB2077APTG4.