Description
In the case of translating between 3.3V and 5V system:
VCCA connects to 3.3V power supply
VCCB connects to 5V power supply
GND connects to power negative pole respectively, the two power supply should be common-grounded with each other
When Ax has TTL 3.3V input, Bx will get TTL 5V output
When Bx has TTL 5V input, Ax will get TTL 3.3V output
NO direction control required
