Features: · Complies with: ·Universal Serial Bus Specification Rev. 2.0 · Advanced Configuration 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-powere...
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|VCC||supply voltage 3.3V||-0.5||+4.6||V|
|VREF(5V0)||input reference voltage 5.0 V||-0.5||+5.25||V|
|VI(5V0)||input voltage on 5 V buffers||3.0 V < VCC < 3.6 V ||-0.5||+6.0||V|
|VI(3V3)||input voltage on 3.3 V buffers||3.0 V < VCC < 3.6 V||-0.5||+4.6||V|
|VO(3V3)||output voltage on 3.3 V buffers||-0.5||+4.6||V|
|Ilu||latch-up current||VI < 0 or VI > VCC||-||100||mA|
|Vesd||electrostatic discharge voltage||on pins DM1 to DM4, DP1 to DP4, 
OC1_N to OC4_N, and all
VREF(5V0) and GND pins; ILI < 1 A
|on all other pins; ILI < 1 mA ||-2000||+2000||V|
The ISP1520 is a stand-alone Universal Serial Bus (USB) hub controller IC that complies with Universal Serial Bus Specification 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 ISP1520 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 ISP1520 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 ISP1520 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 ISP1520 has four downstream facing ports. If not used, ports 3 and 4 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.
The ISP1520 IC is suitable for self-powered hub designs.
An analog overcurrent detection circuitry is built into the ISP1520, which can also accept digital overcurrent signals from external circuits; for example, Micrel MOSFET switch MIC2026. The circuitry can be configured to trip on a global or an individual overcurrent condition.
Each port comes with two status indicator LEDs.
Target applications of the ISP1520 are monitor hubs, docking stations for notebooks, internal USB hub for motherboards, hub for extending Intel® Easy PCs, hub boxes, and so on.