Microchip Technology, Inc. USB2503

General Description 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. *The USBCheck online design review service is subject to Microchip's Program Terms and Conditions and requires a myMicrochip account. Additional Features Note: The USB2503 is not recommended for new designs. The USB2513 is the suggested replacement device for this product. General Features 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 Hardware Features 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