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  • TI Thinks Resolved

About CD74HC4511

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Replies: 7

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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

  • 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
  • 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
  • In reply to Joseph Wu:

    Thanks Joseph. Is there anything else we can help you with Nat?


    Looking for a low voltage translator? Check out the AXC family that supports 0.7V to 3.3V translation!

    The Logic Minute training page has videos on many interesting topics that all are kept shorter than 5 minutes.

  • In reply to Emrys Maier:

    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

  • In reply to Nat Wong:

    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.


    Looking for a low voltage translator? Check out the AXC family that supports 0.7V to 3.3V translation!

    The Logic Minute training page has videos on many interesting topics that all are kept shorter than 5 minutes.

  • In reply to Emrys Maier:

    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
  • In reply to Nat Wong:

    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.


    Looking for a low voltage translator? Check out the AXC family that supports 0.7V to 3.3V translation!

    The Logic Minute training page has videos on many interesting topics that all are kept shorter than 5 minutes.

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