| ??? 02/22/10 15:07 Read: times |
#173428 - what blather Responding to: ???'s previous message |
http://ww1.microchip.com/downloads...40171a.pdf said:“Typical” parameters can and do vary in different applications. All operating parameters, including “Typicals”, must be validated for each customer application by the customer's technical experts.
what blather, who in hades can 'validate' typical parametres as a design citeria when they "can and do vary". In addition the sentence is dead wrong "typical' parametres can and do vary in different foundry runs, not in "different applications" an engineer more skilled than me (such do exist :) ) and yours truly once spent more than a month chasing a "once a week hit" bug in a 500 TTL chip system (pre micro) which we finally traced down to some so called engineer having designed to 'typical' values. the reason the problem 'suddenly' appeared turned out to be that the brand of a standard TTL chip was changed by purchasing and since the BOM stated 'generic' no alarm was raised. Erik |
| Topic | Author | Date |
| Zero crossing detector - technique adoption | 01/01/70 00:00 | |
| Sounds like a bad idea to me! | 01/01/70 00:00 | |
| relying on parasitic diodes | 01/01/70 00:00 | |
| Confusing | 01/01/70 00:00 | |
| I mean | 01/01/70 00:00 | |
| Designing to typical values | 01/01/70 00:00 | |
| what blather | 01/01/70 00:00 | |
| " IDEA ? " - RIDICULOUS | 01/01/70 00:00 | |
| at least for this one | 01/01/70 00:00 | |
| Oh dear: | 01/01/70 00:00 | |
| tough, but true | 01/01/70 00:00 | |
| just caught this one | 01/01/70 00:00 | |
| Idiom | 01/01/70 00:00 | |
| It really is a *very* bad idea! | 01/01/70 00:00 | |
| Don't blindly follow app note | 01/01/70 00:00 | |
| It's not so much the parasitic diodes... | 01/01/70 00:00 | |
| two reasons | 01/01/70 00:00 | |
| What should I do ... | 01/01/70 00:00 | |
| That won't help at all! | 01/01/70 00:00 | |
| two wrongs | 01/01/70 00:00 | |
| Most app-notes don't work ... because they're wrong! | 01/01/70 00:00 | |
| This is typical ... | 01/01/70 00:00 | |
| I hate to tell this,... | 01/01/70 00:00 | |
App engineers not always the sharpest tools in the shed | 01/01/70 00:00 | |
| Unbelievable!! | 01/01/70 00:00 |