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LM3643: Are SDA/SCL open drain or push-pull?

Part Number: LM3643

Hi Team,

1. Are SDA/SCL in LM3643 an open drain?

2. If I2C is floating first then power in and EN turn on, does it have any concern?

3. If power in and EN turn on first then I2C floating, does it have any concern?

Best regards,