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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