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Tristate Level Shifter

Tristate Level Shifter
There are some Arduino users who would like to expand the amount of RAM on their board. They will then often arrive at the 23K256 SRAM chip, which is provided with an SPI interface. However, when trying to use this IC they will then discover the problem that this IC is allowed to operate at a maximum supply voltage of only 3.6 V, while the Arduino operates at logic levels of 5 V.
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