General description
The ISP1521 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)

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-powered capability
■ USB suspend mode support
■ Configurable 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 configuration
■ Simple I2C-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 traffic monitoring (GoodLink™) for the upstream facing port
■ Uses 12 MHz crystal oscillator with on-chip Phase-Locked Loop (PLL) for low ElectroMagnetic Interference (EMI)
■ Supports temperature range from −40 °C to +70 °C
■ Available in LQFP80 package.

Applications
■ Monitor hubs
■ Docking stations for notebooks
■ Internal hub for USB motherboards
■ Hub for extending Easy PCs
■ Hub boxes.