Jeesh-
Seems to be a rather trivial piece of engineering to have a patent attached!
David

Bob Blick wrote:

>Better be careful, that use of a mosfet (interfacing between buses of
>different voltages) is covered by US patent #5689196
>
>I don't know what limits Philips puts on its use, but I'd bet if you use
>it for anything other than I2C interfacing, you are out of the realm of
>"free" licensing.
>
>-Bob
>
>
>
>>Phillips recommends using mosfets as level shifts for I2C.  The cicuit
>>is below:
>>          +3V     +3V      +5v
>>           |       |        |
>>           |      ---       |
>>           R   ---------    R
>>           |    |  ^  |     |
>>           |    |  |  |     |
>>  3V line -+----+--+  +-----+--- 5V line
>>                |     |
>>                +-->|-+
>>
>>
>
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