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CD4052B: CD4052 Any issues using 3.3 V vih?

user5102208
Intellectual 820 points
Part Number: CD4052B
Other Parts Discussed in Thread: TMUX1209

Hi all,

There is something confusing about CD4052 application.

And according to the datasheet of CD4052, the min of input high voltage is 3.5 V under VDD=5v condition, but 3.3V coming from MCU also can pass the test!

I doubt whether is there any risk on this application or need I do the level *** to satisfy the voltage request?

looking forward to your reply!

BR!

  • 0
    TI__Mastermind 45350 points

    User5102208,

    The datasheet specifies a recommended operating min Vih which is the guaranteed across process variations.  You are likely seeing success at 3.3 V because there is some margin in this spec.  I can only comment on recommended operating conditions and you will have to do your own engineering analysis and system qualifications if you want to operate outside the datasheet recommendation.

    Thank you,

    Adam 

  • 0 in reply to Adam Torma
    Intellectual 820 points

    Adam,

    Thanks for your reply!

    You say that I see the success because of the margin, and could you show me what's the margin range? like ±0.3V or something else? and I am not sure if the margin range of all devices is the same or not？

    This leads me how to  modify my application and avoid the uncertain design risk!

    Thanks again!

    BR!

  • 0 in reply to user5102208
    TI__Mastermind 45350 points

    BR,

    Our specs are stated to make sure we are delivering our customers quality parts.  Since we can't predict everything in a manufacturing millions of  semiconductor products, it is common for specifications to have some margin built in to make sure things are covered like process and material variation. 

    I can only guarantee the specifications in the datasheet. To help avoid the uncertain design risk I can recommend using a different part that covers your requirements like the TMUX1209.

    Thank you,

    Adam