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Altera_Forum
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13 years ago

Altera Classic PLCC Programming

Hi there, just joined the forum. I have a problem with obsolete Classic PLCC chips, being: EP1810LC-25T, which is used to control an embedded controller with a Motorola 68020 CPU. The seem...
Altera_Forum's avatar
Altera_Forum
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13 years ago

HI Derek,

Not sure I can help you regarding the date code part of your question, but I can shed some light on the Erasure of the EP1810.

Check out the ordering info from a 1991 Altera Data Book.

Link from my Hobby electronics Website.

http://www.digital-circuitry.com/images/webpage/mylab/altera/altera_classic_part_numbers.jpg (http://www.digital-circuitry.com/images/webpage/mylab/altera/altera_classic_part_numbers.jpg)

The "EP1810LC" part number as you can see from the diagram the "L" indicates a one-time-programmable component.

It could be that components after a particular date that were normally OTP, became Electronically Erasable. For instance the EP1810LC components.

See this page From a 2001 Datasheet:

http://www.digital-circuitry.com/images/webpage/mylab/altera/altera_part_numbers.jpg (http://www.digital-circuitry.com/images/webpage/mylab/altera/altera_part_numbers.jpg)

As you can see in the form from the link above....for the "L" suffix EP1810 components, the OTP is no longer indicated.

However I'm not %100 sure that this is the case.

Regards,

-Gerry