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hanyfmankarios
Egypt
3 Posts |
 Posted - 12/18/2018 : 21:45:11
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Hi everybody
I need to program a group of EProms 27C1001-12 , I bought brand new chips , but when I made a blank check to all of them, I got that are not blank, there are some bits that contain a small amount of data...Is that normal ?
and how about if I write my file to those chips? I didn't try... but I expect that when verified it will give error !!!
Please advise... |
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| Reply #1
anniel
2572 Posts |
Posted - 12/19/2018 : 08:08:21
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quote:
Originally posted by hanyfmankarios
Hi everybody
I need to program a group of EProms 27C1001-12 , I bought brand new chips , but when I made a blank check to all of them, I got that are not blank, there are some bits that contain a small amount of data...Is that normal ?
and how about if I write my file to those chips? I didn't try... but I expect that when verified it will give error !!!
Please advise...
Where did you buy your "brand new" chips? Pictures? |
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| Reply #2
hanyfmankarios
Egypt
3 Posts |
Posted - 12/19/2018 : 11:31:20
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I bought them from a local market ( Electronic shop)
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| Reply #3
anniel
2572 Posts |
Posted - 12/19/2018 : 14:19:19
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quote:
Originally posted by hanyfmankarios
I bought them from a local market ( Electronic shop)
I'm asking because those chips are out of production for eons now and you are probably dealing with fakes or pulls at best.
Did you try erasing the chips, unless you have OTP devices?
Do they ID correctly? |
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hanyfmankarios
Egypt
3 Posts |
Posted - 12/20/2018 : 23:29:32
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I tried to erase other chips that are not new using a UV exposing device used for exposing PCB's for more than half an hour, but unfortunately data still not erased.
Concerning the chip ID ,I have to uncheck the "Check ID" button to be able to load the data stored on those "brand new" chips , other than that the read operation gives error. |
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| Reply #5
anniel
2572 Posts |
Posted - 12/21/2018 : 05:08:32
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quote:
Originally posted by hanyfmankarios
I tried to erase other chips that are not new using a UV exposing device used for exposing PCB's for more than half an hour, but unfortunately data still not erased.
You need a real chip eraser.
quote:
Originally posted by hanyfmankarios
Concerning the chip ID ,I have to uncheck the "Check ID" button to be able to load the data stored on those "brand new" chips , other than that the read operation gives error.
There is no way those chips are new if data is present on them.
Moreover if the ID does not correspond to the datasheet your chips are fake.
http://www.mcumall.com/forum/topic.asp?TOPIC_ID=8418
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27C1001 Blank check problem
