beautypg.com

SMSC USB2524 User Manual

Usb2524 usb multiswitch, Datasheet, Product features

background image

SMSC USB2524

DATASHEET

Revision 1.91 (08-22-07)

Datasheet

PRODUCT FEATURES

USB2524

USB MultiSwitch

TM

Hub

„

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 I

2

C 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

Table of contents