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???
02/06/07 21:14
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 		 #132167 - Just to play it safe
Responding to: ???'s previous message
The AT89S52 in 40 pdip, which is likely a 100% pin compatable replacement for your chip, is $2.01 USD at Digikey, which is about $2.38 CDN today

Just to play it safe, I'd stay away from the Atmel 'S' chips, there have been 100s of posts "I can not get the download to work" and all have been replied to/resolved by purchasing the 'authorized' Atmel download cable at $25. I know that 'some' have succeeded with a homemade rig, but doubt it will be the right thing in this case due to the difficulties so many have had. Once Mike get something to run, he can 'play' with the 'S' chip, it might even be an idea to buy it in the sam order as the below.

What is known working is the UART download. The Philips P89V51RD2 sells for $7.01 or if it has to be Atmel, the AT89C51ED2 sells for $8.50 both qty 1. Both are available (and priced) in 40-dip.

Ok that is more than the $2.01 for the 'S' chip, but I think Mike by now need a afe bet even if it is $5 more.

For economy and UART download, there is the Philips P89LPC935 that, while not pin compatible (28PLCC) is a dymanite chip selling at 3.06 albeit in PLCC (.1" sockets available).

Mike, should it happen that you see the light and decide to buy from DigiKey (or somewhere else that has current parts) DO present the whole thing and the BOM, so we can (try to) save you paying shipping charges twice.

Erik

List of 45 messages in thread
TopicAuthorDate
CMOS?            01/01/70 00:00      
   74HC and 74HCT IS CMOS!            01/01/70 00:00      
      yes            01/01/70 00:00      
         a datasheet and a calculator            01/01/70 00:00      
   Why do you want to "process the PSEN signal" I kno            01/01/70 00:00      
      You need to stick your nose in the books, Mike            01/01/70 00:00      
         umm.            01/01/70 00:00      
            WHAT are you doing with the PSEN ?            01/01/70 00:00      
               programmer + system            01/01/70 00:00      
                  80C51BH doesn't have EPROM            01/01/70 00:00      
                     He's using it as an 80C31            01/01/70 00:00      
                     im meant            01/01/70 00:00      
                  Ambiguous            01/01/70 00:00      
                     LPT            01/01/70 00:00      
                        Is it T0 and T1, or T1 and T2?            01/01/70 00:00      
                           T0 and T1 and, for a '52 T2            01/01/70 00:00      
            What do you mean \"ummm\"            01/01/70 00:00      
               welcome to "Trying"            01/01/70 00:00      
                  nobody thinks you're stupid, however ...            01/01/70 00:00      
                     answer.            01/01/70 00:00      
                        why screw with the clock?            01/01/70 00:00      
                           stop trying to make deals!            01/01/70 00:00      
                              not necessarily            01/01/70 00:00      
                                 ok            01/01/70 00:00      
                                    sorry, I goofed            01/01/70 00:00      
                              Because...            01/01/70 00:00      
                                 Yes, but will it work? It's ATMEL ... (yechhh!)            01/01/70 00:00      
                                 Just to play it safe            01/01/70 00:00      
                                    or try the Maxim/DALLAS parts ...            01/01/70 00:00      
                                       BINGO            01/01/70 00:00      
                                       Not a good first chip            01/01/70 00:00      
                                          What's his primary purpose            01/01/70 00:00      
                                       Mike - FREE CHIP            01/01/70 00:00      
                        An easier way?            01/01/70 00:00      
                           if he is to get another chip, then            01/01/70 00:00      
                              Harder than it needs to be            01/01/70 00:00      
                                 Let him do what he wants! He'll learn something.            01/01/70 00:00      
                                    a small correction            01/01/70 00:00      
                                       Well, I wouldn't know ... I don't use ATMEL            01/01/70 00:00      
                                    answers....            01/01/70 00:00      
                                       TOTALLY and ABSOLUTELY incorrect. if "the flash            01/01/70 00:00      
                                          .            01/01/70 00:00      
                                             Mike ,,, there are other problems ...            01/01/70 00:00      
                        There may be some surprises ...            01/01/70 00:00      
               two Timers            01/01/70 00:00      

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