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are modern IC minimum specs accurate/precise ?

Discussion in 'Electronic Components' started by robb, Sep 30, 2007.

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  1. robb

    robb Guest

    i was re-checking the specs on the A618SEP replacement for my
    SN75518N ....
    advertised as drop in replacement

    and i noticed that the minimum clock for A6818 is 10 MHz @ 5v
    and the SN75518 has a 1-5 MHz range @ 5v which is quite a ways
    out of spec from the replacement's specs

    do you suppose the A6818 will work in the 1-5 MHz range ?

    what is the experience with these sorts of operational minimums ?
    i guess they would not state a minimum if there was no real
    minimum ?

    if it turns out that the a6818 does not function due to spec
    what would (is there something) one could do to get this
    replacement to work ?

    i have not tried yet but imagined this may be a problem and did
    not wnat to start etching my adapter if there is some
    solution/control chip i will need to add to my adapter

    thanks for any advice,
  2. Don Bowey

    Don Bowey Guest

    The A6818SEP spec sheet has a strange way of expressing the clock frequency

    Look at the far left (Characteristics) clock column - It says they are going
    to express the MAXIMUM frequency. Then in the Limits column for 5V they
    give a Minimum of 10 MHz and a Typical of 33 MHz.

    What that means is, the maximum frequency is at least 10 MHz, but most
    devices will work to 33 MHz. You may use a frequency of 1-5 MHz and be
    assured it will work.

    I'd call their expression a negative positive

    They didn't.
  3. robb

    robb Guest

    thank you,
    i was getting all psych'd about etching this board and then the
    specs were not looking good.
    thanks Don for the big sigh of relief,
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