| ??? 11/05/06 03:20 Read: times |
#127383 - It can withstand it for exactly 347msec! Responding to: ???'s previous message |
Ap said:
I am using 3.3V micro which has an absolute maximum rating given as -.3V to +3.8V VDD .Can anyone tell me till what time the device could bear this rating 200ms 500ms etc , no duration has been mentioned in the datasheet. It can withstand it for exactly 347msec! Hhm, would this answer satisfy you?? Why not? How should a chip design and fabrication process have to look like, that would guarantee such a specified life time?? Just by physical intuition you should be able to answer this question by yourself. Why must a chip design provide some headroom? How high can manufacturing tolerances be? Why must a chip withstand a higher voltage than the recommended nominal voltage plus tolerance of voltage regulator? What defects can be covered by the warranty of manufacturer, that gives you a chance to buy a cheap chip but at the same time does not ruin the manufacturer? If you couldn't answer my questions, the answer to your question is: 1. The chip manufacturer specifies the reliability, life time and similar issues only for an operation of chip within the nominal supply voltage range, which is 3.3V +-5%, for instance. Supply voltage of chip must never leave this range, otherwise reliability can suffer. 2. Stressing the chip beyond the absolute maximum ratings can result in an immediate destruction. It may withstand it "a bit" longer, for 142nsec, 3hours, or 137years, but the manufacturer will not guarantee this. Or by other words: It's on your own risk to leave the nominal supply voltage range. You cannot make the manufacturer responsible for any bad surprise then. Kai |
| Topic | Author | Date |
| Absolute maximum Rating .. | 01/01/70 00:00 | |
| It doesnt really work like that | 01/01/70 00:00 | |
| It can withstand it for exactly 347msec! | 01/01/70 00:00 | |
| It can withstand it for exactly 347msec! | 01/01/70 00:00 | |
| More details needed about your crowbar circuit! | 01/01/70 00:00 | |
| More details needed ......... | 01/01/70 00:00 | |
| Crowbar SCR, trip time of fuse... | 01/01/70 00:00 | |
| a fun story | 01/01/70 00:00 | |
| Yes | 01/01/70 00:00 | |
| oscillate and switch-on and -off | 01/01/70 00:00 | |
| It is protection | 01/01/70 00:00 | |
if overvoltage crowbars | 01/01/70 00:00 | |
| Part Damage from high voltage | 01/01/70 00:00 | |
| what is all this about a crowbar | 01/01/70 00:00 | |
| What is all this about switchers, Erik? | 01/01/70 00:00 | |
| it is that as | 01/01/70 00:00 | |
| stay away from building switchers | 01/01/70 00:00 | |
| no, switch mode power supplies | 01/01/70 00:00 | |
| Yes and no | 01/01/70 00:00 | |
| It heavily depends | 01/01/70 00:00 | |
| POWER SUPLIES | 01/01/70 00:00 | |
| Plinio Babo, why no (protected) e-mail in your pr | 01/01/70 00:00 |