Noob question here.
Currently I'm using a darlington transistor array to drive about 14 IR leds. I want to be use a CD74HC4067 multiplexer to simplify and shrink things up a bit. The IR led's I'm using require 100ma of current, so from what I understand, the problem is that this multiplexer cannot handle this amount of current.
From the multiplexer's datasheet, it says at 4.5V, the "on resistance" is 70 Ohms. Correct me if I'm wrong, I'm assuming this means that the maximum current that it can handle is around 64ma given by Ohms law.
Put simply, this is the what I'm trying to achieve:
My questions are:
Assuming the aforementioned is correct, is there a way to change the "on resistance" to handle 100ma of current, or temporarily reduce the amount of current passing through until exiting the multiplexer?
If so, is this as simple as adding a resistor somewhere or how to do so?
If I'm completely off, I'd appreciate suggestions or advice.