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Bi-directional I²C level shifter

Bi-directional I²C level shifter
The advantages and ease of use of an I²C link are well known. Since its introduction almost 20 years ago, it has been applied in more than 1000 types of IC. All these ICs are designed for operation from a 5 V power supply. However, more and more ICs coming on to the market use a 3.3 V supply. The bi-directional shifter described in this application note is intended to interconnect two sections of an I²C-bus system, each section with a different supply voltage and different logic levels
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