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???
09/20/11 15:22
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#183809 - They seem to live a long time ...
Responding to: ???'s previous message
While the manufacturers seem to forget about the "new" programmable logic products they produce within weeks of shipping the first samples, obsoleting them with the next die shrink, I've got some CPLD's that I've been using in my work that are still supported, though no longer ubiquitous, with their software, and that are still available through distribution though they're nearly 20 years old. They're no longer cheap, i.e. one 128-macrocell CPLD I have been using since the late '80's, that I bought for somewhere on the order of $4 each now appears to cost $18, which explains why I don't buy them any longer. That's an extreme example, but it would address your issue with bit-wise direction setting as well as level shifting between a 3V3 MCU and a 5V0 interface. There are, indeed, cheaper solutions available today. I suspect some of them will continue to be available for many years.

RE




List of 40 messages in thread
TopicAuthorDate
Bit-configurable transceiver chips            01/01/70 00:00      
   Suggesting....again...            01/01/70 00:00      
      Alas 5V needed and ribbon cables are a bit "rough"            01/01/70 00:00      
   Another Suggestion....            01/01/70 00:00      
   level translator            01/01/70 00:00      
      Alas, "weak output drive" and no input hysterese            01/01/70 00:00      
      TI sn74gtl2010            01/01/70 00:00      
         or NXP GTL2010,GTL2000            01/01/70 00:00      
            looks promising            01/01/70 00:00      
            NXP GTL20xx -> NVT20xx            01/01/70 00:00      
         Need to read more to understand them            01/01/70 00:00      
            looks like the cat's miauw            01/01/70 00:00      
   NXP has ....            01/01/70 00:00      
      I2C or SPI just can't get even close to the huge bandwidth            01/01/70 00:00      
         nope, no I²C clocks            01/01/70 00:00      
            extender, not expander            01/01/70 00:00      
   I have been wondering this myself            01/01/70 00:00      
      Supported capacitance seems to be the snag            01/01/70 00:00      
   Differential SPI            01/01/70 00:00      
      Serial -> buffers on adapter boards is a potential solution            01/01/70 00:00      
   Have you considered programmable logic?            01/01/70 00:00      
      I had suggested this as well            01/01/70 00:00      
         Yes ... I remember that ...            01/01/70 00:00      
            Long life            01/01/70 00:00      
               They seem to live a long time ...            01/01/70 00:00      
                  Adapters            01/01/70 00:00      
                     These aren't necessarily so "huge"            01/01/70 00:00      
                        Not huge in size            01/01/70 00:00      
                           Some of them can handle that.            01/01/70 00:00      
                              Yes and no            01/01/70 00:00      
                                 There are ways ...            01/01/70 00:00      
                                    Body diodes            01/01/70 00:00      
                                       serial termination ...            01/01/70 00:00      
                                          Yes, current- and bandwidth-limiting components used            01/01/70 00:00      
                                             you youing whippersnappers, pay attention            01/01/70 00:00      
            pedantry, again            01/01/70 00:00      
               What would YOU suggest?            01/01/70 00:00      
   Here's a thought ...            01/01/70 00:00      
      Probably            01/01/70 00:00      
         I'd sugest you consider older CPLD's            01/01/70 00:00      

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