| ??? 05/20/05 13:32 Read: times |
#93644 - has happened Responding to: ???'s previous message |
What about a damaged (overheatetd) component? I suffered once from such a failure...
This has happened to me too, but I would hold the likelyhood of that being the cause of the OPs problem at or below 1%. As an example: I just fixed a problem in a new design where I had the boards made in Taiwan. They by mistake had used a 0 ohm resistor instead of 1k so an input was shorted to Vcc. This board ran (was driven) for an hour or more before the short was found and removed. When that short was removed a 74HC14 which during the testing was driving DIRECTLY into the short to Vcc still worked. Out of curiousity I had the board temp etc tested and it passed with flying colors. Of course, I replaced the chip, a benign crack in the silicon can spread, but I am still amzed that the chip survived. Erik |
| Topic | Author | Date |
| Temperature and 89C2051 | 01/01/70 00:00 | |
| Chip Grade? | 01/01/70 00:00 | |
| A bit vague | 01/01/70 00:00 | |
| oscillator? | 01/01/70 00:00 | |
| Built-in Pierce oscillators ARE reliable | 01/01/70 00:00 | |
| Freeze spray | 01/01/70 00:00 | |
| Overheated parts, too hot soldering? | 01/01/70 00:00 | |
| I have my doubts | 01/01/70 00:00 | |
| What about this? | 01/01/70 00:00 | |
| has happened | 01/01/70 00:00 | |
| Re: has happened | 01/01/70 00:00 | |
| Microwave oven | 01/01/70 00:00 | |
| not microwave, but toaster oven | 01/01/70 00:00 | |
| Thanks for replies | 01/01/70 00:00 | |
| How about this | 01/01/70 00:00 | |
| Wait a minute... | 01/01/70 00:00 | |
| Improvements | 01/01/70 00:00 | |
| resist | 01/01/70 00:00 | |
| Quartzes, etch resist | 01/01/70 00:00 | |
| Quartz Crystals | 01/01/70 00:00 | |
| Quartz crystals | 01/01/70 00:00 | |
no problem | 01/01/70 00:00 | |
| Maybe! | 01/01/70 00:00 | |
| Maybe! | 01/01/70 00:00 | |
| LED temperature rating? | 01/01/70 00:00 |