Post by thread:[EE]: Mixing 5V and 3.3V logic, which chips to cho

Hi, I need to interface 5V logic (pic) with 3.3V logic. The i/f is SPI and hence I need signals going both ways. CS 5V->3.3V SCLK 5V->3.3V SDO 5V->3.3V SDI 3.3V->5V DV 3.3V->5V My guess is that there exist dedicated chips for this but I haven't used them sofar and therefore I don't know which manufacturers and or designation. I know I can make the i/f with additional small signal transistors, but I do not like this solution as the component count in relation to feature is to high. And unfortunately I cannot run the pic at 3.3V as I have alot of other chips that need the 5V. Eventually I will probably replace most of them and go 3.3V all they way, but at the moment I need the 'proof of concept' realised with the current design. Regards, /Tony -- http://www.piclist.com hint: To leave the PICList spam_OUTpiclist-unsubscribe-requestTakeThisOuTmitvma.mit.edu>