Max memory time help

Discussion in 'General Electronics Chat' started by Robin Mitchell, Sep 23, 2010.

  1. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    Hi everyone,

    Do memory chips have max access times?
    I know they have min access times. I want to make a circuit that can read and write to sram but i want to start by using switches and see if i can store some data.

    Like set CS to high etc etc..
    Or does this have to be fast?
    Little hard to explain, sorry

    Thanks,
    Robin
     
  2. Markd77

    Senior Member

    Sep 7, 2009
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    I had a look at a 24LC64 datasheet I had handy and there doesen't seem to be any minimum speed requirement. I'd suggest trying it, but make sure the switches are debounced.
     
  3. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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  4. Markd77

    Senior Member

    Sep 7, 2009
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    The datasheet suggests it should be fine. It's going to be tricky, good debouncing on the control lines, and the problem that data in and out is on the same lines. It might need some buffering because the outputs are very low current capability.
     
    Robin Mitchell likes this.
  5. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    Yay :)
    awsome
    post too short |:I
     
  6. retched

    AAC Fanatic!

    Dec 5, 2009
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    I would just be SUPER aware of the currents you are applying to the memory registers over such a long period (slower that a few dozen nS)

    IT IS DEFINATELY possible to use pushbuttons and manual switches to record to memory... The thing is, newer memory may consider long pulses to be a fault.

    This info should be in the datasheet (which I have not read)
     
  7. Robin Mitchell

    Thread Starter Well-Known Member

    Oct 25, 2009
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    when the computer uses the mem circuit it will do it very very quickly but i am buying a spare so i can get it to work :)
     
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