In the case of translating between 3.3V
and 5V system: VCCA connects to 3.3V
power supply. VCCB connects to 5V
power supplyGND connects to power
negative pole respectively, the two
power supply should be common- grounded with each otherWhen Ax has
TTL 3.3V input, Bx will get TTL 5V
outputWhen Bx has TTL 5V input, Ax will
get TTL 3.3V outputNO direction control
required
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