On 09/03/2015 06:17 AM, andy pugh wrote:
>
> I made a small run of DB25 to RaspberryPi breakouts that were
> bidirectional using the almost-magic GTL2000
> http://uk.rs-online.com/web/p/voltage-translators/0510695/
>
GTL (Gunning Transceiver Logic) is a special logic family 
that is not really compatible with other logic types.
it is VERY fast, and I guess it might work out to be 
compatible with some other logic families.  Usually, the 
logic levels are 0.4 and 1.2 V.

Jon

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