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cannot write to EEPROM

Discussion in 'General Electronics Discussion' started by Fairface, May 21, 2017.

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  1. Fairface


    May 21, 2017
    So I tried to build a simple manual EEPROM programmer to program the chips just by switches. I am able to read from the chips (all outputs are 1), but I am not able to write into them by bringing notWE low and than high again (while notOE is high). When I set it to output it outputs all ones at the IO pins as before no matter what I try to program into it. I have tried 3 different EEPROMs with the same results. I have also tried to disable the software data protection, but nothing has changed. I have measured the voltage on all pins few times and it all seems to be fine (voltage around 5,04V). I am using the AT28C256-15PU datasheet:
    Has anyone experienced something similar? Any ideas why is this happening?
  2. Bluejets


    Oct 5, 2014
    Circuit diagram?
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