To the EEs in the crowd - speak slowly, I am a programmer. I have a circuit that is comprised of a number of components that require a 5V supply and use 5V signal lines (such as a MAX232). I would like to integrate a DS1337 (real time clock) but its max Vcc is 4V and the MAX V on the signal pins is 4.5V. Am I going to be forced to split the bi-directional signal line and use diodes and a voltage divider? -- Glen Wiley Those who can - code. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu