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???
09/28/06 12:17
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 		 #125275 - "real-world" or "old-world"?
Responding to: ???'s previous message
I find it VERY inconvenient to drive real-world circuitry from devices that are not 5-volt capable and can't drive at least 6 mA on those outputs

"real-world" or "old-world"?

I freely admit that my transition from 5V to 3V3 involved dragging, kicking and screaming. Every argumnt I hear about "stay with 5V" has been made by me in the past.

The reality, however, is that once you have made the transition, things get real comfy e.g. if you want to connect a FPGA, then the availability in 3V3 is ENORMOUS comapared to the availability in 5V.

Yes, I use level converters and such to connect to SOME other things, but is driving a relay from a 3V3 pin any different from driving it from a 5V pin, hardly; the interface is the same (save maybe a resistor value).

The fact is that if you want to use current technology, you are more or less (and every day more) forced to embrace lower voltages.

Erik

List of 46 messages in thread
TopicAuthorDate
what next after 8051?            01/01/70 00:00      
   Should be in Chat!            01/01/70 00:00      
      ARM7            01/01/70 00:00      
         not 5-volts!            01/01/70 00:00      
            not 5 volts?            01/01/70 00:00      
               Not exactly ...            01/01/70 00:00      
                  "real-world" or "old-world"?            01/01/70 00:00      
                     can't deny it ...            01/01/70 00:00      
      chat            01/01/70 00:00      
         No, not that chat!            01/01/70 00:00      
   DS80C390            01/01/70 00:00      
   Current processor?            01/01/70 00:00      
      after 8051            01/01/70 00:00      
         Nothing to do with ARM            01/01/70 00:00      
         Why 8051?            01/01/70 00:00      
            Crystal            01/01/70 00:00      
            Crystal            01/01/70 00:00      
               You didn't answer the question!            01/01/70 00:00      
                  some thoughts            01/01/70 00:00      
                     Needs more thought!            01/01/70 00:00      
               you say you need performance, are you even thin            01/01/70 00:00      
                  only 20MHz in the 6-clock mode            01/01/70 00:00      
                     only 20MHz in the 6-clock mode            01/01/70 00:00      
                        yeah...            01/01/70 00:00      
                           not QUITE hopeless            01/01/70 00:00      
                        the whole thread seems a waste of effort            01/01/70 00:00      
                           Understatement!            01/01/70 00:00      
         you might want to stick to '51... or not...            01/01/70 00:00      
         Why that crystal frequency?            01/01/70 00:00      
   that is SOME design            01/01/70 00:00      
      Strange Design            01/01/70 00:00      
         an example            01/01/70 00:00      
            bugger..            01/01/70 00:00      
               They had an 8-pin and a 14-pin PIC, didn't they?            01/01/70 00:00      
   ALL of the above is a pie in the sky            01/01/70 00:00      
      Maybe it is for a PABX?            01/01/70 00:00      
      DS80C390            01/01/70 00:00      
         I thought that, too. Why dig deeper?            01/01/70 00:00      
            What does Sandeep Gupta say?            01/01/70 00:00      
               8051 >>> ARM            01/01/70 00:00      
                  Look at the code before changing cpu            01/01/70 00:00      
                  Sandeep Gupta must be a manager            01/01/70 00:00      
                     Blinded by the problem            01/01/70 00:00      
      5V ARM            01/01/70 00:00      
         Well, that's interesting!            01/01/70 00:00      
   have you considered a multiprocessor            01/01/70 00:00      

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