On 09/03/2015 10:58 AM, Gene Heskett wrote: > On Thursday 03 September 2015 10:49:23 Jon Elson wrote: > >> 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 >> > But it claims to be able to do 5 volt logic. Is there a gotcha they don't > discuss? > > Apparently, this device can't do bidirectional translation. It can do 22 channels of conversion all going to a lower voltage, or all going to a higher voltage. But, when wired that way, it can't flip direction, which might be useful in some cases. It seems that this chip is NOT a true Gunning transceiver, or even a transceiver at all. The parts I mentioned are more flexible. There are also automatic translators, that detect which side is driving, and automatically flip which way they drive accordingly, on a line by line basis.
Jon ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
