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carlsson

Sweden
3 Posts
Posted - 04/04/2007 :  10:44:25  Show Profile
Hello,

I'm a new and so far happy customer who ordered a True USB programmer plus an eraser. I must give credit to the post office; package was sent from Canada on Thursday and arrived in Sweden (overseas) on Tuesday.

Anyway, the eraser didn't come with any particular instructions. I have successfully made an adapter cable to fit my wall outlet. The specs says it takes up to 6-8 EPROMs in one turn. Is that max, or can I fill the drawer as much as it fits if I have many smaller chips?

The timer is graded OFF - 1 - 2 - 3 - 4 - 5 - 6 - ON. How long should I let it run if I want to erase a set of EPROMs? Should it always be winded to 6 and let it work downwards, or is it dependent of the number of chips I loaded it with? Can the chips be harmed if they are subject to UV light for too long; I suppose not?

Sorry for seemingly novice questions, but I didn't find anywhere else on this forum/site (perhaps on a different site) answering these simple questions.

Regards

Anders Carlsson
Reply #1

ZLM

2945 Posts
Posted - 04/07/2007 :  07:34:06  Show Profile
You can put the EPROM in drawer as many as you can, as long as you do not stack the chips in drawer.

The timer is 0 - 60 minutes timer. With a ON position. Most of EPROM will be erased in 20 minutes. But you can put 30 minutes just make sure it been erased 100%.

Longer erase time should not damage the chip.
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Reply #2

DL

USA
46 Posts
Posted - 07/10/2007 :  13:28:44  Show Profile
Hi,
quote:
Originally posted by ZLM

The timer is 0 - 60 minutes timer. With a ON position. Most of EPROM will be erased in 20 minutes. But you can put 30 minutes just make sure it been erased 100%.
Another option is to blank check the EPROMs at low voltage (VCC=4.2-4.45V) after a few minutes in the eraser. As soon as the blank check at low voltage, you're done.
quote:
Longer erase time should not damage the chip.
UV exposure does damage EPROMs. Maximum lifetime exposure is ~7000 Wsec/sq. cm (about 1 week of exposure). EPROMs are only rated for 100 erase cycles.

HTH,
Dennis
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Reply #3

ZLM

2945 Posts
Posted - 07/10/2007 :  20:46:06  Show Profile
Thanks DL for the UV information.
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Reply #4

ukez

9 Posts
Posted - 07/18/2007 :  14:46:20  Show Profile
good to know :)
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