- 2008-08-31 4:08 pm
I've done this already but get crazy figures:
High-Level Output Voltage, VOH IO = –30mA VDD–0.7(min) VDD–0.4(typ) VDD(Max)
Low-Level Output Voltage, VOL IO = +30mA 0(min) 0.4(typ) 0.7(max)
I (mA) V R (ohm)
30 4.6 153.333333 for High
30 0.4 13.333333 for Low
So 83 ohm but this seems too high, no? I think I heard 20 to 30 mentioned somewhere as a reasonable figure?
What's wrong with my technique above?
Think again for high. On output you have between 0.4V - 0.7V voltage drop and current through is 30mA, what is resistance?