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> > What is the 25 series from Microchip?

I know three manufactures of SPI EEPROMs for that 25 series:
  - Microchip
  - Xicor
  - Atmel
The price is almost the same no matter the brand.

There are EEPROMs from 128 bytes to 16 Kbytes in such serie.

My two cents.

Luiz Marques