[USMA:30993] Fw: Seeking info on JEDEC rules

[Euric]

----- Original Message ----- From: Bob Neves To: Euric Sent: Tuesday, 2004-08-31 09:45 Subject: RE: Seeking info on JEDEC rules Euric,   I am sorry, but I do not recall any specific rule or requirement in a JEDEC specification for Metric�  I am glad and sorry to see that the US is become almost the ONLY metric less country (and that Burma and Liberia have moved forward)� I, as an engineer am a Metric Believer, bet still find it personally hard to use as the US system makes it difficult, but the electronics industry in general here in the states is still metric illigetimate (or is it illiterate)�.  They are being forced by design to change but it is SLOW!!!!   Great to see my old articles are still read occasionally!!! Thanks!!  And yes, the world�s best Chef�s are from Metric Countries (with the exception of the UK where I have yet to find good food)� I am writing this from China where our newest test facility is located�   Take Care,     Best Regards, Bob Neves President Microtek Laboratories +1 (714) 999-1616 www.TheTestLab.com www.HATS-Tester.com     From: Euric [mailto:[EMAIL PROTECTED] Sent: Sunday, August 29, 2004 7:06 AM To: Bob Neves Subject: Seeking info on JEDEC rules   2004-08-29   Mr. Neves,   While searching the Internet for information on a particular JEDEC rule on IC chip spacing, I came across the article you wrote in 1998 called "The Metric Mile".  See:   http://www.thetestlab.com/data/jan99.pdf   I would like your help in pointing me in the right direction.  I am looking for the specific JEDEC rule which requires that IC chip pin spacing be in metric dimensions.  If I am not mistaken, it is in the format X.XY, where X is any number from 0 to 9 and Y is restricted to being a 0 or a 5 and the units are millimetres.  I believe this ruling went into effect sometime around 1990.  Can you provide me with the name or JEDEC specification name/number for this rule?  I would appreciate it.   Can you also provide me info, if possible and not a lot of trouble, what has changed since you wrote your article in 1998.  I'd be curious to know.       In reference to your article, there is a mistake concerning the nations of Burma and Liberia.  Actually their economy (what little there is of it) is entirely metric.  They are considered non-metric only because their governments never made an official declaration to convert.  Due to heavy dependence of products and services from neighbouring countries, their purchases and use of products is metric.  Visitors to these countries have reported extensive metric usage.  The only things not metric are some machines left over from the colonial periods.  These two countries need to be taken off the list of non-metric countries.   As for cooking, I think Julia Childs did some  cooking with metric recipes to show how it would be done and everything worked out fine.  Don't forget, the world cooks in metric and the best chefs come from metric cooking countries.  That should tell you something there.   Thank you for your time and efforts,   Euric