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DS1225AB Datasheet

This DS1225AB-200 (8k x 8 = 64kB NVSRAM) is from 1995 and is probably dead (cannot measure from the outside.) The only close replacement in stock is a DS1230AB-100 (32k x 8 = 256kB.)

  • Looking at the two datasheets, the pin-outs are identical except for the inclusion of A13 and A14 on the larger-capacity variant. Can I statically pull these to a rail and have it work?
  • Any other caveats to consider? The timings look similar as well.
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    That's why they are NC on the older package. You'll still only get 8K of course, unless you bring them out to switches or port pins... –  Oct 12 '20 at 20:43

1 Answers1

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Yes, this worked.

As long as the voltage matches, speed is not slower than the original, and any excess address pins are tied to a rail, it will appear to be equivalent.

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