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I have found a circuit that uses a BAS16 small signal diode to level shift a 5V (or 3.3V) TTL signal down to a 1.8V TTL signal. The cathode of the diode is on the high voltage side and the anode is on the low voltage side, so it looks like it is backwards compared to the direction of current flow. http://i.imgur.com/Ke5Cv.jpg".
I imagine the 1.8V input pin is high-z so very little current will sink into the pin already, much less anymore with the small current going through the reversed diode.
Has anyone seen this done before or knows how this works?
Thanks
I imagine the 1.8V input pin is high-z so very little current will sink into the pin already, much less anymore with the small current going through the reversed diode.
Has anyone seen this done before or knows how this works?
Thanks
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