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UCC21220: Responses when DIS pin is opened / UCC21220 and UCC21520

Hideaki Nambu
Mastermind 9165 points
Part Number: UCC21220
Other Parts Discussed in Thread: UCC21520

Tool/software:

Hello,

Can I ask if the parts will be enabled or disabled when their DIS pins are opened ?
The descriptions in their datasheets sounded differently for me when compared tables of pin functions and logic:

UCC21220 DS Rev.G

ucc21220 question.tif

UCC21520 DS Rev.F

ucc21520 question.tif

  • +1
    TI__Expert 6220 points

    Hi Hideaki, 

    UCC21220 has an internal pull-up resistor on DIS and UCC21520 has an internal pull-down resistor on DIS. Thus if DIS is left floating, UCC21220 will be disabled while UCC21520 will be enabled. 

    We recommend actively driving the DIS pin or tying the DIS pin to GND if not used. 

    Thanks, 

    Vivian