Overview
The TUSB2046BIRHBT, produced by Texas Instruments, is a 3.3-V CMOS hub device designed to comply with the Universal Serial Bus (USB) specification as a full-speed hub. This device features one upstream port and four downstream ports, making it suitable for various USB applications. The TUSB2046BIRHBT is implemented with a digital state machine, eliminating the need for firmware programming. It integrates fully compliant USB transceivers for all upstream and downstream ports, supporting both full-speed and low-speed devices by automatically adjusting the slew rate based on the attached device's speed.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package Type | VQFN (RHB) | - |
| Number of Pins | 32 | - |
| Body Size (Nominal) | 5.00 mm × 5.00 mm | mm |
| Operating Temperature Range | -40 to 85 | °C |
| Supply Voltage (VCC) | 3.3 | V |
| Upstream Port Speed | Full-speed, Low-speed | - |
| Downstream Port Speed | Full-speed, Low-speed | - |
| Power Source Modes | Bus-Powered, Self-Powered | - |
| Maximum Current per Downstream Port (Bus-Powered) | 100 mA | mA |
| Maximum Current per Downstream Port (Self-Powered) | 500 mA | mA |
| Clock Source Options | 6-MHz Crystal or 48-MHz Input Clock | - |
Key Features
- Fully compliant with the USB specification as a full-speed hub
- 3.3-V low-power ASIC logic
- Integrated USB transceivers for all upstream and downstream ports
- No firmware programming required due to state machine implementation
- One upstream port and four downstream ports
- Supports full-speed and low-speed operations on all downstream ports
- Two power source modes: bus-powered and self-powered
- Power switching and overcurrent reporting available in ganged or per-port configurations
- Supports suspend and resume operations
- Programmable vendor ID and product ID with external serial EEPROM
- 3-state EEPROM interface allows EEPROM sharing
- Push-pull outputs for PWRON eliminate the need for external pullup resistors
- Noise filtering on OVRCUR provides immunity to voltage spikes
- Package pinout allows 2-layer PCB design
- Low EMI emission achieved by a 6-MHz crystal input
- Migrated from the proven TUSB2040 hub with lower cost and enhanced system ESD performance
- No special driver requirements; works seamlessly with any operating system with USB stack support
Applications
- Computer systems
- Docking stations
- Self-powered USB hub products
- Other USB-based peripherals and devices requiring multiple USB ports
Q & A
- What is the TUSB2046BIRHBT?
The TUSB2046BIRHBT is a 3.3-V CMOS hub device that provides one upstream port and four downstream ports, compliant with the Universal Serial Bus (USB) specification as a full-speed hub.
- What are the power source modes supported by the TUSB2046BIRHBT?
The device supports both bus-powered and self-powered modes.
- How many downstream ports does the TUSB2046BIRHBT have, and what speeds do they support?
The device has four downstream ports that support both full-speed and low-speed operations.
- Does the TUSB2046BIRHBT require firmware programming?
No, the device is implemented with a digital state machine, eliminating the need for firmware programming.
- What clock source options are available for the TUSB2046BIRHBT?
The device can use either a 6-MHz crystal or a 48-MHz input clock.
- How does the TUSB2046BIRHBT manage power switching and overcurrent detection?
The device supports both ganged and per-port power switching and overcurrent detection configurations.
- What is the maximum current that can be drawn from each downstream port in self-powered mode?
In self-powered mode, each downstream port can supply up to 500 mA of current.
- Does the TUSB2046BIRHBT require special drivers to operate?
No, the device works seamlessly with any operating system that has USB stack support.
- What are the benefits of using a 6-MHz crystal input for the TUSB2046BIRHBT?
Using a 6-MHz crystal input helps achieve low EMI emission.
- Can the TUSB2046BIRHBT be used in a 2-layer PCB design?
