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WEBENCH® Tools/LSF0108: LSF0108 Pull up resistor

Part Number: LSF0108


Tool/software: WEBENCH® Design Tools

My project I would like to use LSF0108 level converter for SPI,I2C,UART ,GPIO pin interfacing with various 5v external module to 3.3V TM4C1294 controller .My doubt is when i need to add pull up resistor?? .

This lines are confused me when i am reading datasheets  .

                       "If either output is push-pull, data must be unidirectional or the outputs must be tri-state and be controlled by some direction-control mechanism to prevent HIGH-to-LOW bus contention in either direction. If both outputs are open-drain, no direction control is needed".

 

kindly give some explanation to my understand.

Thanks in advance.