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## Links to USB sites

- USB.org documentation on USB standards: <http://www.usb.org/developers/docs/>
- Wikipedia webpage on USB: <http://en.wikipedia.org/wiki/USB>
- USB in a Nutshell - an introduction to USB: <http://www.beyondlogic.org>
- A direct link to the USB 2.0 standard:
  - [http://www.usb.org/developers/docs/usb\_20.zip](http://www.usb.org/developers/docs/usb_20.zip)
- This page has links to USB host controller, hub, and tranceiver chips:
  - <http://www.lvr.com/usbchips.htm>

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### Some tranceiver chips that were reviewed during the node design

- USB tranceivers allow direct single ended, unidirectional logic pins to communicate on the differential bidirectional USB electrical specification. Tranceivers often provide provide some electrical ESD protection as well.
- Micrel MIC2550A
  - USB to logic level down to 1.6 volts, Full Speed, 11kV ESD protection, 14-TSSOP
  - [http://www.micrel.com/\_PDF/mic2550a.pdf](http://www.micrel.com/_PDF/mic2550a.pdf) Micrel also has an application note on USB bus power. See this page for information:
    <http://www.micrel.com/page.do?page=product-info/USB.shtml#trans>
- Maxim MAX3344E
  - USB to logic level, Full Speed, Internal 1.5 k ohm pull up, 15kV ESD protection, 14-TSSOP
  - [http://www.maxim-ic.com/quick\_view2.cfm/qv\_pk/4188](http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4188)
- Sipex SP5301
  - USB to 3.3 or 5V logic level, Full Speed, very low power, low cost, 14-SOIC
  - <http://www.sipex.com/Files/DataSheets/sp5301.pdf>
- Fairchild USB1T11AMTC
  - USB to 3.3 or 5V logic level, Full Speed, 9.5 kV ESD protection, 14-TSSOP
  - <http://www.fairchildsemi.com/ds/US%2FUSB1T11A.pdf>