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TLC374 and TLV2454 cutting traces

Brian Wang
Expert 8355 points
Other Parts Discussed in Thread: TLC374, TLV2454

Hi,

 

A design I am currently modifying requires cutting ouput traces on the following devices TLC374 Quad  pack and  a TLV2454 Quad pack of unused comparators. Can I leave the inputs floating and the outputs unused?

 

Thanks in advance for the help

 

Regards,

Brian Wang

 

  • 0
    Intellectual 860 points

    Generally it's not a good idea to leave inputs floating, but the TI guys may have some guidance for this specific part.  It is best to tie inputs to force a specific output and not rely on chance. Otherwise, with floating inputs the device can end up oscillating and can draw large supply currents or introduce a lot of noise on the power rails.

    For opamps, I ground the NI input and configure the amp as a follower (assuming ti is unity stable, which the TLV2454 is).  This keeps the device properly biased and keeps the output out of saturation.  For comparators, I tie the NI input high and the inv input low.  However, sometimes you need to tie the inputs through current limiting resistors depending on the input structure.

    Sorry I can't be more specific about these devices, but this should give you a starting point.

    Best of luck,

    Tim