| ??? 01/18/07 01:24 Read: times |
#131012 - What has survived your "tests" must be correct? Responding to: ???'s previous message |
Purushottam said:
The specifications say "Pins are NOT guaranteed to sink currrent
greater than the listed conditions-----" which does mean that drain/collector current is LIMITED ! That's the only way to understand the phrase "not guaranteed"?? All your wrong semantic misinterpretations! If your english is limited so that you cannot understand, what the datasheet tells, you should ask someone who can. But the last thing you should do is to make statements which are entirely wrong! If you cannot understand, what "not guaranteed" means, then please look at the absolute maximum ratings and the allowed maximum dc output current, which is 25mA in Andy's link. So, the manufacturer indeed has an interest to allow no more than 25mA, maybe in order to limit the internal heat dissipation?? More, why should the manufacturer specify the maximum DC output current, when it's already internally limited?? Purushottam, what you state is complete nonsense! Purushottam said:
What I had stated is actual
experimental stuff that is no variation of intensity in LED from serries resistor from 33ohms to 150 ohms. Also I did say that micro was much cooler with higher resistor. So, the current limiting resistor does matter, yet? Maybe to keep the internal heat dissipation within safe limits, just what I mentioned above?? You are 30years in this buisiness, but you don't know, why it makes sense to limit the DC output current?? And you don't know, that the user must do this, externally, by the help of suited current limiting resistor?? Purushottam said:
The rise time is correctly one period of
RC constant which is 66% of of Vcc. No, it is not. Normally, by rise time we mean the 10% to 90% rise time. Not that it really matters here, but you should not confuse the numbers, when helping a newbie. Purushottam said:
The 'ringing' and
other stuff is same. People have used such ports and WITH 4.7K resistors as pull ups. With serial frequencies of 100Khz max there is no such great ringing causing harm. You have no clue what I mean, right?? You don't know what capacitive cross coupling is and how to limit this by the use of low impedance drivers?? Purushottam said:
see that some few 'expert' people have grabbed this forum
and instead of guiding people properly doing job of scarring novice people. One person even has threatened not to post unless people 'obey' his way! And you recommend a newbie to violate the absolute maximum ratings of datasheet! Yeah, you are properly doing your job... Purushottam said:
What I have stated is by experience of manufacturing many
hundreds units. Yes, what has survived your "tests" must be correct, must be the truth. What the manufacturer states in his absolute maximum ratings is bullshit, of course... Have fun, Kai |
