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???
02/04/05 01:19
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 		 #86505 - MAX691+battery
Responding to: ???'s previous message
Hi.

My Maxim spec sheet for the MAX691A says the prop delay is 6-10nS
Well, here's the link to the very pdf in maxim web site: http://pdfserv.maxim-ic.com/en/ds/MAX...MAX695.pdf
Page 8, the two last paragraphs in the bottom right. Of course the link refers to a MAX691 not MAX691A, and as you and Kai mentioned it's prop. delay sounds good. Hope the 691A version sold in the electronic bazaar here, pray for me! Have a glance at the second paragraph of the pdf of which I ain't understand nothing!

clock rate or the type of sram
11.0592 + 70ns SRAM

That's your decision
By not using the feature, I meant let the /CS pin of SRAM be connected to the decoder circuit as before and just pull-up this line to Vo of MAX691. Is it not all that that MAX691 configuration does (Of course in a system that uses just one SRAM)Is anything wrong with this configuration?

Personally, try to avoid battery backed up designs where possible
will do, but: I need some means of storing the data sent from compy to the LED display. EEPROMs like 28C512 are too slow to write to in a serial ISR unless @ ~300bps. FLASHs like 29F512 have the silly sector erase structure, FLASHs like 28F512 (my second best alternative) can be written to byte-by-byte but suffer from the need to be erased prior to write, NVRAMs like DS1245 or MZ48Tsomething are not found here, and the same story applies to FRAMs so I ended up with the lousy SRAM+battery solution. Got any better idea? By the way the SRAM will be something like 621000...I ain't decided yet.

please try to be specific
Sure, will do.

Best.


List of 23 messages in thread
TopicAuthorDate
/CE propagaion delay in MAX691            01/01/70 00:00      
   Prop delay in max691            01/01/70 00:00      
      Batteries            01/01/70 00:00      
         or check out the FLASH+RAM combination            01/01/70 00:00      
         FRAM            01/01/70 00:00      
            another option            01/01/70 00:00      
               ZMD            01/01/70 00:00      
                  that's the one            01/01/70 00:00      
      MAX691+battery            01/01/70 00:00      
         what is the problem            01/01/70 00:00      
   How can that be off topic            01/01/70 00:00      
      the matter            01/01/70 00:00      
         It's definitely on-topic!            01/01/70 00:00      
   NEVER design with typicals            01/01/70 00:00      
   MAX691 versus MAX691A, leakage currents            01/01/70 00:00      
      take note, Kai is using the right value            01/01/70 00:00      
         MAX691A            01/01/70 00:00      
      EEPROM            01/01/70 00:00      
         EEprom            01/01/70 00:00      
            And.....            01/01/70 00:00      
   more Qs on /CE            01/01/70 00:00      
      This is more like a valid question            01/01/70 00:00      
      timing diagrams            01/01/70 00:00      

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