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

over 8 years ago

0 Ivan Salazar over 8 years ago

TI__Guru* 95145 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 Joseph Wu over 8 years ago

TI__Guru* 92655 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 Emrys Maier over 8 years ago in reply to Joseph Wu

TI__Guru* 96591 points

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

0 Nat Wong over 8 years ago 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 Emrys Maier over 8 years ago in reply to Nat Wong

TI__Guru* 96591 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 Nat Wong over 8 years ago 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 Emrys Maier over 8 years ago in reply to Nat Wong

TI__Guru* 96591 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.

Logic

Logic forum

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