To make the design as bullet proof as possible.....best to use a translator of some sort. I am currently using some 74LCX07 parts to do much the same. PIC drives out to these OD buffers, so just adding the pullup on the output does the job. When you assert a high on the input, it drives them to ground. I'm interfacing the PIC that is running on 3.3V to logic running on 1.2V, 1.8V,2.5V. This part should work fine for you since your not doing any bi-directional stuff. Groups wrote:Thanks for the feedback on this issue. Kind Regards David Huisman ----------------------------------------------------------------------- ORBIT COMMUNICATIONS Pty Ltd - Wireless Solutions that Work (Telemetry, Control, Monitoring, Security, HVAC ...) A.C.N. 107 441 869 Website : http://www.orbitcoms.com PO Box 4474 Lakehaven NSW 2263, AUSTRALIA Phone: 61-2-4393-3627 Fax : 61-2-4393-3685 Mobile: 61-413-715-986 -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf Of Jan-Erik Soderholm Sent: Tuesday, 28 June 2005 11:58 PM To: piclist@mit.edu Subject: RE: [PIC] 3V3 to 5V LCD interface > A series resistor on each line will allow the diodes to clamp > the levels > on the PIC pins to 3v3 without drawing excessive current from the LCD > signal drivers. But, designing in the use of the clamping/protecton diods, is a bad idea, isn't it ? Maybe just a resistor based voltage divider 5V -> 3.3 V ? Jan-Erik > > Peter > > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit. edu/mailman/listinfo/piclist > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist