Hi,
According to this, the -ln((Vps-Vth)/Vps) part (I assume you are referring to Supply Voltage and (upper) Threshold Voltage respectively?), you expect to see the same timing whether the lower threshold (in your example) is 5.99V or 0.01V
Eh ?I am sorry, I got the relationship 'upside down'. It should have been -ln(.4). -ln (10v-6v)/10v.
-ln {(Vps-Vth)/Vps}. Of course the threshold for devices will vary, I was just pointing out that it probably would not be 50% -ln (10v-5v)/10v (.693).
According to this, the -ln((Vps-Vth)/Vps) part (I assume you are referring to Supply Voltage and (upper) Threshold Voltage respectively?), you expect to see the same timing whether the lower threshold (in your example) is 5.99V or 0.01V
I think I have it in an book about interfacing from the eighties. I'll see if I can find it and scan it (or, if I get the time, draw it the hard way).As far as the RS232 thing, yes a graph showing all the players would be great.