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  1. designchain

    Improving Setup and Hold timing

    Uhhh, yeah - I agree with IRstuff and nbucska. Do a little (or more likely a lot of) simulation and you might figure it out... Mike -- Mike Kirschner Design Chain Associates, LLC http://www.designchainassociates.com
  2. designchain

    Configuring all three counters on a 8254 chip

    Oh my...I know this won't be a useful post but I had responsibility for quality and reliability of the 8254 at Intel over 20 years ago...this is an ANCIENT (but useful) device...redesign now! ;o) Mike -- Mike Kirschner Design Chain Associates, LLC http://www.designchainassociates.com
  3. designchain

    Microelectronic Component Life

    MIL-HDBK-217F hasn't been updated in a long time so, while it's good to get basic concepts down it's near useless for calculating reliability (and it has never been a paragon of accuracy either...but that's not to say it has been useless; on the contrary it did have a purpose). Each...
  4. designchain

    Lead Free/RoHS Compliance

    Thanks, Kerem. SCPCOMP, the exemption I think you're referring covers "lead in solders for network infrastructure equipment for switching, signalling, transmission as well as network management for telecommunication". Is CATV considered Telecommunications by the EU? Some guidance might be...
  5. designchain

    MTBF Degradation of CPU's After Sustained Overtemp

    sreid, no hornet's nest at all. It's my experience that mechanical failure is the first order of magnitude problem with most assemblies...MIL-HDBK-217 and Bellcore based reliability calculations/estimates reflect that fact. It's not "electronics reliability", though, that's excessively...
  6. designchain

    Fake UK Plug

    If telling them doesn't work, quantify it for them. Mike -- Mike Kirschner Design Chain Associates, LLC http://www.designchainassociates.com
  7. designchain

    Round LCD display?

    So what's round? The glass? Are the characters placed only in lines in the middle or are they throughout the circle? Or is it graphic? Need more info...including how many you need over what period of time. Mike -- Mike Kirschner Design Chain Associates, LLC http://www.designchainassociates.com
  8. designchain

    Fake UK Plug

    Management at your company clearly needs a little education (OK, a LOT of education) on how a contract manufacturer operates, what drives them (their "agenda") and why it might not be the same as your management's agenda and what to do about it, how to calculate actual cost of sales...
  9. designchain

    Fake UK Plug

    Rich and TwnB are dead-on. Controlling an out-of-sight/out-of-mind supplier, or even internal division is a challenge. You must make sure they understand what it means when you specify a certain supplier for a certain component...it means they must not substitute. Make the consequences for them...
  10. designchain

    Parts management of Caps by EIA classification

    Yes...that'll get their attention! Interchangeability is the keyword. Once you set the precedence of allowing your AML to be polluted because what is viewed as a secondary component property is irrelevant to one design, you will live to regret it. Mike -- Mike Kirschner Design Chain...
  11. designchain

    Die shrink qualifications and management

    ewinter, It's situation-dependent. I agree with IRstuff that the new devices must be simulated and tested in new designs. The practical issues in assigning a new internal part number include a) whether the new die rev can be positively identified by packaging information - did the mfr rev...
  12. designchain

    electronic component engineer

    EPN? What the devil is EPN? If you mean EBN, it stopped publishing on December 15, 2003. It will be replaced by a new monthly magazine called Electronics Supply and Management in a couple months. Our website has a page that describes what WE think the job of Component Engineering is (and all...
  13. designchain

    Internal Part Description Standards

    Frank's book, while excellent, spends precious little time on classification and description standards. The "Drafting Zone" is interesting but doesn't look like there's going to be much there, even for mechanical description standards. Mike -- Mike Kirschner Design Chain Associates...
  14. designchain

    JLCC x PLCC IC packages

    Rather than take a swag, review the package drawing for your part, and the programmers' socket (should be in the documentation for it or available from the manufacturer). You can also go to JEDEC.org and get the standards (if you can identify them...). Or, as nbucska says, get an adapter from...
  15. designchain

    Internal Part Description Standards

    There are no "industry standards" for component description as you're describing...yet. This is actually quite a substantial undertaking when you sit down and think about it. At a former employer we had two documents totalling about 150 pages that descibed abbreviations, what...
  16. designchain

    Part Number Format Industry Standards

    I'm not aware of any specific studies to determine which has a "better" ROI. They would have to be fairly recent (last 5-7 years) to be of value because software systems that manage parts/boms today are somewhat superior (as are sources of data) to those that existed before in terms of...
  17. designchain

    MTBF, MTTF interpretation

    Msinger - If the MTTF is 20K hours for a given device and your population is 100 units, you should expect 1 or fewer failures out of your population after 20K total device hours (or, in this case, an "average" of 200 hours per device). By the way, there's always confusion between MTTF...
  18. designchain

    KH232AI/CLC232AI

    Good luck on this one. Looks like Fairchild was the last one. They only gave 3 months notice...if you have enough volume maybe you can get them to run one last lot for you, if you missed the EOL buy.... -- Mike Kirschner Design Chain Associates, LLC http://www.designchainassociates.com
  19. designchain

    Search powerful database for electronical components

    There are a number of database-based systems out there to do this. Some (not all) of the questions are: do you want to define all the part classes and parametrics yourself or do you want to use a pre-existing structure? And do you already have lots of this information/content stored somewhere...
  20. designchain

    I need SPICE models for 2N5160 and 2N3866!

    Right - or contact this guy: http://qrp.kd4ab.org/1998/981220/0035.html Maybe he got them... -- Mike Kirschner Design Chain Associates, LLC http://www.designchainassociates.com

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