The USB2503 3-port hub controller is fully compliant with the USB 2.0 Specification and does not require firmware development. When connected to a USB high-speed host, the three downstream ports can operate at low-speed (1.5Mb/s), full-speed (12Mb/s), or high-speed (480Mb/s). As required by the USB 2.0 Specification, the USB2503 is fully backward compatible with legacy USB full-speed hosts.
A default configuration is available in the USB2503 following a reset. This configuration may be sufficient for some applications when it is desired to save the expense of an EEPROM. The controller may be configured from a microcontroller or an external EEPROM. When using the microcontroller interface, the USB2503 appears as a SMBus slave device. The EEPROM interface supports a 2-wire I2C device.
All required resistors on the USB ports are integrated into the USB2503. This includes all series termination resistors on D+ and D- pins and all required pull-down and pull-up resistors on D+ and D- pins. The over-current sense inputs for the downstream ports have internal pull-up resistors.
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Note: The USB2503 is not recommended for new designs. The USB2513 is the suggested replacement device for this product.
- Compliant with USB 2.0 Specification
- Hub Controller IC with Three Downstream Ports
- MultiTRAK&trade Technology Provides One Transaction Translator Per Port
- Default Configuration with Pin Selectable Options
- Flexible OEM Configuration Options
- 48 Pin QFN RoHS compliant package
- Integrated 1.8V regulator
- Integrated Termination and Pull-Up/Pull-Down Resistors
- Internal Short Circuit Protection of DP and DM Lines
- On-Chip Oscillator Uses Low Cost 24MHz Crystal
- Supports Ganged or Individual Over-Current Protection and Power Control
- 3.3V I/O with 5V tolerance
OEM Selectable Features
The 3-Port Hub supports several OEM selectable features:
- Customize Vendor ID, Product ID, and Device ID
- Operation as a bus-powered, self-powered or dynamic-powered hub. (When configured for dynamic operation, the controller automatically switches to bus-powered mode if a local power source is unavailable).
- Select whether the hub is part of a compound device (When any downstream facing port is permanently hardwired to a USB peripheral device, the hub is part of a compound device)
- Select the presence of a permanently hardwired USB peripheral device on a port by port basis
- Configure the delay time for filtering the over-current sense inputs
- Configure the delay time for turning on downstream port power
- Indicate the maximum current that the 3-port hub consumes from the USB upstream port
- Indicate the maximum current required for the hub controller
Pin Selectable Options for Default Configuration
- Select Operation as Either a Bus-Powered Hub or a Self-Powered Hub
- Select Downstream Ports as Non-removable Ports
- Select Downstream Ports as Disabled Ports
- Select Downstream Port Power Control and Over-Current Detection on a Ganged or Individual Basis
- Select Downstream Port Power Control Polarity