ISP1521BE Datasheet

Interface - Controllers


The ISP1521BE is a stand-alone Universal Serial Bus (USB) hub controller IC that complies with Universal Serial Bus Specication Rev. 2.0. It supports data transfer at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s). The upstream facing port can be connected to a Hi-Speed USB host or hub or to an Original USB host or hub. If the upstream facing port is connected to a Hi-Speed USB host or hub, then the ISP1521BE will operate as a Hi-Speed USB hub. That is, it will support high-speed, full-speed and low-speed devices connected to its downstream facing ports. If the upstream facing port is connected to an Original USB host or hub, then the ISP1521 will operate as an Original USB hub. That is, high-speed devices that are connected to its downstream facing ports will operate in full-speed mode instead. The ISP1521BE is a full hardware USB hub controller. All Original USB devices connected to the downstream facing ports are handled using a single Transaction Translator (TT), when operating in a cross-version environment. This allows the whole 480 Mbit/s upstream bandwidth to be shared by all the Original USB devices on its downstream facing ports. The ISP1521BE has seven downstream facing ports. If not used, ports 3 to 7 can be disabled. The vendor ID, product ID and string descriptors on the hub are supplied by the internal ROM; they can also be supplied by an external I2C-bus™ EEPROM or a microcontroller. ISP1521BE Features • Complies with:- Universal Serial Bus Specication Rev. 2.0- Advanced Conguration and Power Interface (ACPI™), OnNow™ and USB power management requirements• Supports data transfer at high-speed (480 Mbit/s), full-speed (12 Mbit/s) and low-speed (1.5 Mbit/s)• Self-powered capability• USB suspend mode support• Congurable number of ports• Internal power-on reset and low voltage reset circuit• Port status indicators• Integrates high performance USB interface device with hub handler, Philips Serial Interface Engine (SIE) and transceivers• Built-in overcurrent detection circuit• Individual or ganged power switching, individual or global overcurrent protection, and non-removable port support by I/O pins conguration• Simple I2 C-bus (master/slave) interface to read device descriptor parameters, language ID, manufacturer ID, product ID, serial number ID and string descriptors from a dedicated external EEPROM, or to allow the microcontroller to set up hub descriptors• Visual USB trafc monitoring (GoodLink™) for the upstream facing port• Uses 12 MHz crystal oscillator with on-chip Phase-Locked Loop (PLL) for low ElectroMagnetic Interference (EMI) ISP1521BE Applications • Monitor hubs• Docking stations for notebooks• Internal hub for USB motherboards• Hub boxes


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