Frank,
What is the voltage at which the address pins, S0-S2, will switch?
I'm guessing that they are cmos and it is around 1/2Vcc? I'm really interested in how close to ground I have to pull the address lines for them to flip to zero (assuming a 20k-47k pullup).
Thanks, Jack
Input Trip Voltage
Moderator: frank
Well, normally input pins have schmitt triggers to avoid false triggering due to noise so you probably want to target 70/30 for the switching points. I.e. about 2.3V or greater for switching high and 1V or less for switching low.
If you are using a 20K pull up on the pin and just switching the pin to gnd when necessary (like in the datasheet) that should be no problem.
If you are using a 20K pull up on the pin and just switching the pin to gnd when necessary (like in the datasheet) that should be no problem.
Frank Thomson
Experimental Noize
Experimental Noize
That should probably work OK. Why through a diode?
amz-fx wrote:I want to pull it low through a diode. So the pin will be about 0.65v above ground.
Should work?
Thanks, Jack
Frank Thomson
Experimental Noize
Experimental Noize