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Lexmark toner cartridge EEPROM IC recognition
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sdancer75:
Can someone recognize the EEPROMs below and point any link with datasheets? Both of them are used in Lexmark's C530dn color laser printer as a security for their toner cartridges.

The SO-8 belongs to the Lexmark original one while the SO-20 from a 3rd party refilled cartridge.

Regards

coromonadalix:
Maybe some hints from this thread ??

https://www.eevblog.com/forum/projects/lexmark-toner-chip-ti046b1/
sdancer75:
I have already read it but it's totally different EEPROM.
sdancer75:

--- Quote from: edavid on November 18, 2019, 07:23:32 pm ---The original chip is a custom part that can't be replaced by any standard EEPROM.  The 3rd party chip is a reverse engineered microcontroller equivalent.

--- End quote ---

Is really a microcontroller or just another EEPROM?

Of course a 20pin IC tends to be microcontroller but why? They could use instead  a standard commercial EEPROM.

Is there a web site that I can find those reverse engineering communication between printer and security chip?

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