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SMSC USB 2.0 controller enables bus-powered hubs

Posted: 04 Apr 2003 ?? ?Print Version ?Bookmark and Share

Keywords:standard microsystems? smsc? usb20h04? hub controller? usb 2.0 controller?

The USB20H04 USB 2.0 hub controller IC of Standard Microsystems Corp. (SMSC) operates two downstream USB ports under bus power if a local power source is not available. The device then switches to self-powered operation with all four ports when a local power source is available.

This feature enables the design of bus-powered USB 2.0 standalone hubs, LCD monitor hubs, docking station hubs, USB 2.0 laptop port replicators, bus-powered card readers, and other power-sensitive applications for USB 2.0 port expansion that require a 480Mbps data rate.

"The USB20H04 will enable USB hub developers to reduce costs and create bus-powered compound USB devices that were not previously possible," said Scott Delaney, SMSC's Director of Marketing for USB Products.

In addition to delivering low power functionality, the USB20H04 will support USB On-The-Go (OTG) Session Request Protocol (SRP) on the upstream port to allow OTG-enabled products, such as cellphones and PDAs, to operate peripherals connected to the hub while they are in host mode.

Full-speed USB peripherals connected to the USB20H04 are capable of achieving maximum connection performance through the use of a dedicated Transaction Translator (TT) for each downstream USB port. The dedicated TT allows each port to support up to the maximum 12Mbps full-speed USB data rate.

The USB20H04 is available as a 10-by-10-by-1.4mm, 64-pin TQFP and is priced at $5.50 in quantities of 1,000.

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