Andrew, One common answer is to use 74LVCxxx logic, which have 5 V tolerant inputs, and rail to rail output swings. When powered at 3.3 V, they are effective level shifters. Be careful that your noise margin on guaranteed high and low states is adequate. You can use the TI web site to get more info on LVC logic www.ti.com (I think), the data sheets are all there. > I am currently designing a board that looks like I am going to > need to put a 3.3v flash memory on a 5v processor. I wondered if > anybody knew of any IC`s that would convert between the two ... -Barry. ------------ Barry King NRG Systems "Measuring the Wind's Energy" http://www.nrgsystems.com Check out the accumulated (PIC) wisdom of the ages at: PIC/PICList FAQ: http://www.piclist.org -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.