I'm trying to make a clock, and as part of that I need to power some IC's. To give a specific example I'm looking at the TI SN74HC163 4 bit counter. After some searching around, I found myself directed to this (basically Ohm's law) equation from the sacred texts:
The problems I'm facing are:
- I'm not sure what to use for current in the equation (I'm that not good at reading datasheets and I'm not sure whether to use ±50 mA or one of the other numbers given to me in the MicroAmp range.)
- Conceptually the equation doesn't make sense to me. If the Voltage drop across a resistor depends on it's proportion of the total resistance of the (series) circuit, then shouldn't I need to have the resistance of the IC? Apparently I don't, but in that case I don't understand how this works.