SMSC USB2524 User Manual
Usb2524 usb multiswitch, Datasheet, Product features
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
Document Outline
- Chapter 1 General Description
- Chapter 2 Pin Layout
- Chapter 3 Pin Configuration
- Chapter 4 Switching Hub Pin Descriptions
- Chapter 5 Switching Hub Block Diagram
- Chapter 6 Assigning Ports
- Chapter 7 Configuration Options
- Chapter 8 LED Interface Description
- Chapter 9 Reset
- Chapter 10 XNOR Test
- Chapter 11 DC Parameters
- Chapter 12 AC Specifications
- Chapter 13 Package Outline