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DIP version of voltage level converter SN74LVC1T45 ?
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FrankBuss:
Fully working example with a FRAM memory chip with 3.3 V, where the SPI port runs at 10 MHz, and an ATmega328, running at 5 V:



Works without problems, problem solved. Yellow is the clock signal from the microcontroller and green the MISO signal from the memory, measured at the microcontroller input:

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