Spin Semiconductor

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

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.

I want to pull it low through a diode. So the pin will be about 0.65v above ground.

Should work?

Thanks, Jack

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

Why through a diode?

I guess;
Couldn't find an encoder and tries to make own ,by using some kind of switches,is it.