USB2503A-HZH(2006) Datasheet PDF - SMSC -> Microchip

General Description
The SMSC 3-Port Hub is fully compliant with the USB 2.0 Specification and will attach to a USB host as a Full-Speed Hub or as a Full-/High-Speed Hub. The 3-Port Hub supports Low-Speed, Full-Speed, and High-Speed (if operating as a High-Speed Hub) downstream devices on all of the enabled downstream ports.

PRODUCT FEATURES
■ Integrated USB 2.0 Compatible 3-Port Hub
    — 3 Transaction Translators for highest performance
    — High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and Low-Speed (1.5Mbits/s) compatible
    — Full power management with per port or ganged, selectable power control
    — Detects Bus-Power/Self-Power source and changes mode automatically
■ Complete USB Specification 2.0 Compatibility
    — Includes USB 2.0 Transceivers
■ VID/PID/DID, and Port Configuration for Hub via:
    — Single Serial I2C EEPROM
    — SMBus Slave Port
■ Default VID/PID/DID, allows functionality when configuration EEPROM is absent
■ Hardware Strapping options allow for configuration without an external EEPROM or SMBus Host
■ On-Board 24MHz Crystal Driver Circuit or 24 MHz external clock driver
■ Internal PLL for 480MHz USB 2.0 Sampling
■ Internal 1.8V Linear Voltage Regulator
■ Integrated USB termination and Pull-up/Pull-down resistors
■ Internal Short Circuit protection of USB differential signal pins
■ 1.8 Volt Low Power Core Operation
■ 3.3 Volt I/O with 5V Input Tolerance
■ 48 Pin QFN lead-free RoHS compliant package