https://ww1.microchip.com/downloads/en/DeviceDoc/25AA640A-25LC640A-64K-SPI-Bus-Serial-EEPROM-20001830G.pdf
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25LC640A-E/SN
IC EEPROM 64KBIT SPI 10MHZ 8SOIC
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25LC640AT-E/SN
IC EEPROM 64KBIT SPI 10MHZ 8SOIC
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25LC640AT-I/SN
IC EEPROM 64KBIT SPI 10MHZ 8SOIC

