General Description
The SMSC 4-Port Hub is low power, OEM configurable, MTT (multi transaction translator) hub controller IC with 4 downstream ports for embedded USB solutions. The 4-port hub is fully compliant with the USB 2.0 Specification and will attach to an upstream port as a Full-Speed Hub or as a Full-/High-Speed Hub. The 4- 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.

General Features
◾ Hub Controller IC with 4 downstream ports
◾ High-performance multiple transaction translator MultiTRAK™ Technology Provides one transaction translator per port
◾ Enhanced OEM configuration options available through either a single serial i2C EEPROM, or SMBus Slave Port
◾ 36-pin (6x6mm) and 48-Pin (7x7mm) QFN lead-free, RoHS compliant packages
◾ Footprint compatible with USB2513i and USB2512i (36-pin QFN) to provide designers with flexibility regarding the quantity of USB expansion ports utilized without redesign
◾ Supports industrial temperature range of -40ºC to 85ºC

Hardware Features
◾ Low power operation
◾ Full Power Management with individual or ganged power control of each downstream port
◾ On-chip Power On Reset (POR)
◾ Internal 1.8V Voltage Regulator
◾ Fully integrated USB termination and Pull-up/Pulldown resistors
◾ On Board 24MHz Crystal Driver, Resonator or External 24/48MHz clock input
◾ USB host/device speed indicator. Per-port 3-color LED drivers that indicate the speed of USB host and device connection - hi-speed (480 Mbps), full-speed (12 Mbps), low-speed (1.5 Mbps) (48-pin QFN)
◾ Enhanced EMI rejection and ESD protection performance

OEM Selectable Features
◾ Customize Vendor ID, Product ID, and Device ID
◾ Select whether the hub is part of a compound device (When any downstream port is permanently hardwired to a USB peripheral device, the hub is part of a compound device)
◾ Flexible port mapping and disable sequence. Ports can be disabled/reordered in any order to support multiple product SKUs. Hub will automatically reorder the remaining ports to match the Host controllers numbering scheme
◾ Programmable USB differential-pair pin location
◾ Ease PCB layout by aligning USB signal lines directly to connectors
◾ Programmable USB signal drive strength. Recover USB signal integrity due to compromised system environment using 4-level driving strength resolution
◾ Select the presence of a permanently hardwired USB peripheral device on a port by port basis
◾ Configure the delay time for filtering the over-current sense inputs
◾ Configure the delay time for turning on downstream port power
◾ Configure the polarity of downstream port power control signals
◾ Indicate the maximum current that the 4-port hub consumes from the USB upstream port
◾ Indicate the maximum current required for the hub controller
◾ Supports Custom String Descriptor up to 31 characters in length for:
   – Product String
   – Manufacturer String
   – Serial Number String
◾ Pin Selectable Options for Default Configuration
   — Select Downstream Ports as Non-Removable Ports
   — Select Downstream Ports as Disabled Ports
   — Select Downstream Port Power Control and OverCurrent Detection on a Ganged or Individual Basis
   — Select Downstream Port Power Control Polarity
   — Select USB Signal Drive Strength
   — Select USB Differential Pair Pin location
   — Select on-chip or off-chip voltage regulator mode

Applications
◾ LCD monitors and TVs
◾ Multi-function USB peripherals
◾ PC mother boards
◾ Set-top boxes, DVD players, DVR/PVR
◾ Printers and scanners
◾ PC media drive bay
◾ Portable hub boxes
◾ Mobile PC docking
◾ Embedded systems