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  3. CMOS Test.

CMOS Test.

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  • R Roger Wright

    To clarify a bit, having read the rest of the responses now, the Complimentary part comes from mixing both P- and N- channel structures on a single die - something that had never been tried before. The output stage of a CMOS device consists of a totem-pole configuration of PMOS and NMOS transistors, stacked and biased to maintain a zero voltage at the output when idle. A friend of mine in college worked for a company that beta tested the devices for RCA. They designed an RF board that was supposed to sleep until a sufficiently strong radio signal was intercepted. The boards worked great, but upon further study they discovered that the boards had been built without any power traces. All CMOS devices then were built with protection diodes on the inputs to protect against static discharges. As it turned out, the RF signals were being rectified and were providing enough power to turn on the devices without any DC power supply! Serendipity Lives! I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

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    Rick York
    wrote on last edited by
    #24

    That's an intersting point about the static protection. Some of the early 4000 series CMOS logic gate chips did not have static protection. I remember a friend in high school rubbing his fingers across the pins of a logic chip and a hole was blown in the top of the chip. This was obviously one of the very first series of the chips. (-edit- corrected spelling) The Ten Commandments For C Programmers

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    • R Rick York

      That's an intersting point about the static protection. Some of the early 4000 series CMOS logic gate chips did not have static protection. I remember a friend in high school rubbing his fingers across the pins of a logic chip and a hole was blown in the top of the chip. This was obviously one of the very first series of the chips. (-edit- corrected spelling) The Ten Commandments For C Programmers

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      Roger Wright
      wrote on last edited by
      #25

      The chips I was mentioning were those 4000-series from RCA. Resdel Engineering was a beta tester for the new technology, and one of my friends worked there part time while going to school. It wasn't a bad deal - they got all their parts for free, in exchange for the failure analyses and application notes they wrote for the new parts. Prior to CMOS, we were used to handling TTL, which was virtually indestructible. It was hard to get technicians used to the idea that they could destroy the chip merely by touching it. TTL had input impedances on the order of 10K, while CMOS raised the bar to the Mohm range - a huge difference in the magnitude of voltages that a few stray charges could develop! These days I doubt there's much of a problem with that. The packaging density is so high that it can only be handled by machines. I know of few techs that would attempt to hand assemble a card built on .2 mm lead spacing. I was pretty handy with a soldering iron in my day, but I wouldn't try it! I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

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      • R Roger Wright

        The chips I was mentioning were those 4000-series from RCA. Resdel Engineering was a beta tester for the new technology, and one of my friends worked there part time while going to school. It wasn't a bad deal - they got all their parts for free, in exchange for the failure analyses and application notes they wrote for the new parts. Prior to CMOS, we were used to handling TTL, which was virtually indestructible. It was hard to get technicians used to the idea that they could destroy the chip merely by touching it. TTL had input impedances on the order of 10K, while CMOS raised the bar to the Mohm range - a huge difference in the magnitude of voltages that a few stray charges could develop! These days I doubt there's much of a problem with that. The packaging density is so high that it can only be handled by machines. I know of few techs that would attempt to hand assemble a card built on .2 mm lead spacing. I was pretty handy with a soldering iron in my day, but I wouldn't try it! I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

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        Rick York
        wrote on last edited by
        #26

        Those sure were the old days weren't they ? :) I agree with you. Today there are very few low-count logic gates like those produced. When such things are required people usually use a PLD or go the ASIC approach. In other words, much higher density than four gates in a DIP chip. The Ten Commandments For C Programmers

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        • R Rick York

          Those sure were the old days weren't they ? :) I agree with you. Today there are very few low-count logic gates like those produced. When such things are required people usually use a PLD or go the ASIC approach. In other words, much higher density than four gates in a DIP chip. The Ten Commandments For C Programmers

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          Roger Wright
          wrote on last edited by
          #27

          I wish we could have used PLD/ASIC devices. I attended the Grand Opening party for LSI Logic (one of the pioneers in the field), and even a simple one would have cost me $100,000 for the first prototype! I could buy a lot of circuit board space and DIPs for that price... Now you can buy an array and burn it yourself for a couple of bucks!:omg: I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

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          • C ColinDavies

            Rules : No books, No websites, No cheating. What does CMOS stand for ? [edit] Shog9 won [/edit] Regardz Colin J Davies

            Sonork ID 100.9197:Colin

            I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

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            Glenn Dawson
            wrote on last edited by
            #28

            Everyone who said compl*i*mentary is wrong, it should be complementary. Main Entry: com·pli·men·ta·ry Pronunciation: "käm-pl&-'men-t(&-)rE Function: adjective Date: 1716 1 a : expressing or containing a compliment b : FAVORABLE 2 : given free as a courtesy or favor Main Entry: com·ple·men·ta·ry Pronunciation: "käm-pl&-'men-t(&-)rE Function: adjective Date: 1829 1 : relating to or constituting one of a pair of contrasting colors that produce a neutral color when combined in suitable proportions 2 : serving to fill out or complete 3 : mutually supplying each other's lack 4 : being complements of each other 5 : characterized by the capacity for precise pairing of purine and pyrimidine bases between strands of DNA and sometimes RNA such that the structure of one strand determines the other

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            • C ColinDavies

              I know what CMOS is, but I can never remember what the letters actually stand for. Saying that, I have never had a reason to use any BIOS level flashing stuff, and wouldn't know where to begin. Regardz Colin J Davies

              Sonork ID 100.9197:Colin

              I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

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              Atlantys
              wrote on last edited by
              #29

              Colin Davies wrote: I have never had a reason to use any BIOS level flashing stuff, and wouldn't know where to begin You never flashed your computer's BIOS? (eww... that sounds dirty!) :omg: I've found that sometimes I can only get things to work right when I flash it (like my sound card on my old computer, it had issues with the POS called "Win98").:-D

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              • G Glenn Dawson

                Everyone who said compl*i*mentary is wrong, it should be complementary. Main Entry: com·pli·men·ta·ry Pronunciation: "käm-pl&-'men-t(&-)rE Function: adjective Date: 1716 1 a : expressing or containing a compliment b : FAVORABLE 2 : given free as a courtesy or favor Main Entry: com·ple·men·ta·ry Pronunciation: "käm-pl&-'men-t(&-)rE Function: adjective Date: 1829 1 : relating to or constituting one of a pair of contrasting colors that produce a neutral color when combined in suitable proportions 2 : serving to fill out or complete 3 : mutually supplying each other's lack 4 : being complements of each other 5 : characterized by the capacity for precise pairing of purine and pyrimidine bases between strands of DNA and sometimes RNA such that the structure of one strand determines the other

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                ColinDavies
                wrote on last edited by
                #30

                Yes I agree !! Regardz Colin J Davies

                Sonork ID 100.9197:Colin

                I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

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                • K Kelly Herald

                  Complimentary Metal Oxide Semiconductor. Kelly Herald Software Developer Micronpc, LLC

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                  ColinDavies
                  wrote on last edited by
                  #31

                  Sorry, your answer was judged as incorrect please see here for details. http://www.codeproject.com/lounge.asp?forumid=1159&app=50&fr=101&select=239212&msg=239212#xx239209xx We realise you maybe upset but hope you will continue your tests in the future when you are better prepared. Regardz Colin J Davies

                  Sonork ID 100.9197:Colin

                  I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

                  K 1 Reply Last reply
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                  • R Roger Wright

                    Complimentary Metal-Oxide Semiconductor. Sorry I'm late - I just got in... I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

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                    ColinDavies
                    wrote on last edited by
                    #32

                    Sorry, your answer was judged as incorrect please see here for details. http://www.codeproject.com/lounge.asp?forumid=1159&app=50&fr=101&select=239212&msg=239212#xx239209xx We realise you maybe upset but hope you will continue your tests in the future when you are better prepared. Regardz Colin J Davies

                    Sonork ID 100.9197:Colin

                    I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

                    1 Reply Last reply
                    0
                    • L Lost User

                      Complimentary Metal Oxide Semiconductor Easy ;P Even BB (my bear knew that one) :-D Elaine :rose: Would you like to meet my teddy bear ?

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                      ColinDavies
                      wrote on last edited by
                      #33

                      Sorry, your answer was judged as incorrect please see here for details. http://www.codeproject.com/lounge.asp?forumid=1159&app=50&fr=101&select=239212&msg=239212#xx239209xx We realise you maybe upset but hope you will continue your tests in the future when you are better prepared. Regardz Colin J Davies

                      Sonork ID 100.9197:Colin

                      I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

                      1 Reply Last reply
                      0
                      • G Glenn Dawson

                        Everyone who said compl*i*mentary is wrong, it should be complementary. Main Entry: com·pli·men·ta·ry Pronunciation: "käm-pl&-'men-t(&-)rE Function: adjective Date: 1716 1 a : expressing or containing a compliment b : FAVORABLE 2 : given free as a courtesy or favor Main Entry: com·ple·men·ta·ry Pronunciation: "käm-pl&-'men-t(&-)rE Function: adjective Date: 1829 1 : relating to or constituting one of a pair of contrasting colors that produce a neutral color when combined in suitable proportions 2 : serving to fill out or complete 3 : mutually supplying each other's lack 4 : being complements of each other 5 : characterized by the capacity for precise pairing of purine and pyrimidine bases between strands of DNA and sometimes RNA such that the structure of one strand determines the other

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                        Roger Wright
                        wrote on last edited by
                        #34

                        Entirely correct - I can't spell worth a s&^t when I'm half crocked. I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

                        1 Reply Last reply
                        0
                        • C ColinDavies

                          I know what CMOS is, but I can never remember what the letters actually stand for. Saying that, I have never had a reason to use any BIOS level flashing stuff, and wouldn't know where to begin. Regardz Colin J Davies

                          Sonork ID 100.9197:Colin

                          I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

                          R Offline
                          R Offline
                          Roger Wright
                          wrote on last edited by
                          #35

                          Colin Davies wrote: I have never had a reason to use any BIOS level flashing stuff, and wouldn't know where to begin. I have, and it's always appropriate to start with a quiet prayer... a spare motherboard can be handy, too.:) I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

                          1 Reply Last reply
                          0
                          • C ColinDavies

                            Sorry, your answer was judged as incorrect please see here for details. http://www.codeproject.com/lounge.asp?forumid=1159&app=50&fr=101&select=239212&msg=239212#xx239209xx We realise you maybe upset but hope you will continue your tests in the future when you are better prepared. Regardz Colin J Davies

                            Sonork ID 100.9197:Colin

                            I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

                            K Offline
                            K Offline
                            Kelly Herald
                            wrote on last edited by
                            #36

                            Darn! Disqualified due to a grammatical error! :(( Oh well, I guess I will just have to try again on the next question.:) Kelly Herald Software Developer Micronpc, LLC

                            C 1 Reply Last reply
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                            • K Kelly Herald

                              Darn! Disqualified due to a grammatical error! :(( Oh well, I guess I will just have to try again on the next question.:) Kelly Herald Software Developer Micronpc, LLC

                              C Offline
                              C Offline
                              ColinDavies
                              wrote on last edited by
                              #37

                              yes, Best wishes in future tests. :-) Regardz Colin J Davies

                              Sonork ID 100.9197:Colin

                              I am sick of fighting with Martin, I think I will ignore his posts from here on in, and spend the time working on articles instead. Christian Graus

                              1 Reply Last reply
                              0
                              • R Roger Wright

                                I wish we could have used PLD/ASIC devices. I attended the Grand Opening party for LSI Logic (one of the pioneers in the field), and even a simple one would have cost me $100,000 for the first prototype! I could buy a lot of circuit board space and DIPs for that price... Now you can buy an array and burn it yourself for a couple of bucks!:omg: I'm a Frisbeeterian. We believe that when you die your soul is thrown up on the roof, and you can't get it down.

                                R Offline
                                R Offline
                                Rick York
                                wrote on last edited by
                                #38

                                As the song goes - the times they are a changing. :) The Ten Commandments For C Programmers

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