Wouter van Ooijen wrote: > But I was hoping for a dual-supply chip that could translate for > instance 4 unidirectional signals in each direction. Browsing Mouser I > find lots of 3.3V max translation chips, I2C level shifters (but those > require external pull-ups), and even complete isolators (Si8431 seems > ideal for isolating RS485). But no aparent 5V <-> 3.3V solutions. any > suggestions? The 74LVC1T45 are jellybean single signal chips. Look around in that famil= y and I think there are some dual and quads too. ******************************************************************** Embed Inc, Littleton Massachusetts, http://www.embedinc.com/products (978) 742-9014. Gold level PIC consultants since 2000. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .