USB2524

USB MultiSwitchTM Hub

PRODUCT FEATURES

Datasheet

„USB 2.0 Compatible 4-Port Hub with two upstream host port connections

—Provides electronic reconfiguration and re-assignment of any of its 4 downstream ports to either of two upstream host ports (“on-the-fly”).

—Allows multiple USB hosts to share peripherals and enables a user to dynamically assign host ownership.

–Embedded Mode - 8 (predefined, OEM programmable) configurations for port assignment are selectable via three external control signals.

–Peripheral Mode - Dedicated select pin for every downstream port (total of 4), selectable edge or level triggered in order to support a wide range of possible switch configurations and styles.

—Each host has a dedicated Single Transaction Translator (Single-TT) for supporting FS/LS devices, or can also operate in Multi-TT mode where each downstream port has a dedicated Transaction Translator.

„Downstream ports can be disabled or defined as non- removable

„Switching hub can be configured as compound device for support of ‘embedded’ USB peripherals

„Multiple LED modes for maximum implementation flexibility

—USB Mode - 2 Single-color LEDs for each downstream port (total of 8 LEDs).

—Host Ownership Mode - 8 Single-Color LEDs indicate which upstream host each of the downstream ports are assigned to.

—Host Ownership & Port Speed Mode - 8 Dual-Color LEDs are used to indicate which upstream host each of the downstream ports are assigned to, while simultaneously indicating downstream port connection speed.

„Enhanced configuration options available through either a Single Serial I2C EEPROM, or SMBus Slave Port

—VID/PID/DID

—Port Configuration

—String Descriptors (each can support a maximum length of 31 characters)

–Custom Manufacturer String

–Custom Product String

–Custom Serial String

—Assignment of downstream ports to upstream hosts

—Switching mechanism selection

„Hardware Strapping options allow for configuration without an external EEPROM or SMBus Host

—Default VID/PID/DID, allows functionality when configuration EEPROM is absent

„Complete USB Specification 2.0 Compatibility

—Includes USB 2.0 Hi-Speed Transceivers

—High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and Low-Speed (1.5Mbits/s) compatible

—Full power management with choice of Individual or Ganged power control

„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

„56-Pin QFN Lead-free RoHS Compliant Package

SMSC USB2524

DATASHEET

Revision 1.91 (08-22-07)