Re: Has the Philips web site finally gone to lalaland?

Hello Mike,


Love the "unorthodox use" - can you give more info?


Sorry, but those are designs for clients so I can't post much. Basically it's the "semi-analog" use of CMOS logic chips. The real jewel in the CD4000 series is the CD4007UBE, just take a look at that. Unfortunately none of the other families offer anything like it, probably because that art is lost with new grads who leave the universities with next to nothing in true analog know-how.

I have designed switch mode converters around a few Schmitt inverters and used unbuffered inverters such as the 74HCU04 (not HC04) for analog functions, controlled resistors, gain control and so on. The last design (currently in layout) will feature ye olde 74HC14 on a analog board.

What you have to watch out for when doing this is cross currents. Mainly for the output pair but in the case of buffered devices also for younger stages. This is where good specsmanship comes in and Philips indeed excels here. You need to be able to gauge cross currents reliably over the expected supply voltage range and also across process (lot to lot) tolerance.


Now, Joerg, after you get several hundred thousand app notes and datasheets stored on your hard disk, how do you find the one you are looking for?

I wrote my own index software that runs in DOS and generates a commented entry for each file on my hard disk. The disk is partitioned into 2 gig segments to keep DOS happy. Then a simple Boyer-Moore search program finds any file on the hard disk about a second or so.

How do you manage to solve this problem?


Mostly very low tech, printed and filed. I have an alphabetical hanging file system in the office. Then there is an electronic file directory called "Parts" and it contains subdirectories such as "National" and "TI". Sometimes it has a third level like a sub-directory for the MSP430 under "TI".

Regards, Joerg

http://www.analogconsultants.com
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