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About CD74HC4511

Nat Wong
Genius 3070 points
Other Parts Discussed in Thread: CD74HC4511

Dear Sirs

The following figure show the display and function table (datasheet of CD74HC4511).

But there is some issue between display and function table.

Could you help me for the following question?

Display 6: a is high or low?

Display 9: d is high or low?

BRS

Nat

  • 0
    TI__Guru** 103865 points
    Hi Nat,

    I'll move your post to Data Converters forum.
    If you want to display the 6 like the Display figure, the "a" bit need to be High, but if you set it Low it is still a 6 (The "a" bit is necessary if you need to differ the "6" from the "b").
    The same happens with the 9, if you like to display it like the Display figure, the "d" bit need to be High, but if you set it Low it is still a 9.
    Hope this help you.

    Best regards,
    Iván Salazar
    Texas Instruments
  • 0
    TI__Guru* 95055 points
    Nat,


    Hopefully Ivan has answered your question, but this part is a logic part and I've moved it to the Logic Forum.

    Technically this belongs in Logic/Specialty Logic/Encoder, Decoder, Multiplexer.


    Joseph Wu
  • 0 in reply to Joseph Wu
    TI__Guru* 96947 points
    Thanks Joseph. Is there anything else we can help you with Nat?
  • 0 in reply to Emrys Maier
    Genius 3070 points

    Dear Sirs

    Thank you. 

    But I want to know the following example.

    When I set input :

    LE/=L

    BL/=H

    LT/=H

    D3=L  D2=H  D1=H  D0=L

    The output bit a is "H" or 'L'?

    BRS

    Nat

  • 0 in reply to Nat Wong
    TI__Guru* 96947 points

    Nat,

    This is an error on the datasheet.  The 'a' and 'd' outputs highlighted in red are supposed to be H.  This can be verified by following the logic diagram in the datasheet.

    We will add this to our list of corrections to be made.  Thank you.

  • 0 in reply to Emrys Maier
    Genius 3070 points
    Dear Sirs
    My customer test the sample.
    Sample test result 'a' and 'd' outputs highlighted in red are L.

    Could you help me?

    BRS
    Nat
  • 0 in reply to Nat Wong
    TI__Guru* 96947 points
    Nat, I'm confused. Are you saying that the datasheet is correct, and you need help explaining that? or that the datasheet is incorrect and we need to fix it? I can order samples of this part and test for myself, but that will take some time.