According to Jan Axelson's book a 36 ohm resistor is required in 
series at each drivers output, to act as source terminations that 
reduce reflections when the outputs switch. She goes on to say that 
these resistors may be on or off chip.

:: Looking around, I see some applications of micros and USB with
::
:: 22 to 27 ohm resistors in series with D+ and D-.


Colin


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 cdb, colin@btech-online.co.uk on 22/04/2006

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