This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • Resolved

CD74HC4050: Is there marking correct ? (CD74HC4050)

Prodigy 80 points

Replies: 13

Views: 1666

Part Number: CD74HC4050

I checked document of the Standard Linear & Logic Semiconductor Marking Guidelines".

   --> This chip output signal is 5V.(VCC input 5V) 

   --> But this chip output signal is 4.4V (VCC input 5V)

In the first figure, the position of G4 is marked on pin 6, but in the second figure the position of G4 is pin 7 marking.

Is the production year different and the performance the same? I want to know if it is genuine TI.

Thank you 

Best Regards 

June

  • Hi June,

    The date codes are different which could explain the slight difference of the marking. The performance should be the same, are the loads the same when testing the device?

    Check out our new AXC family of Voltage Translators! 

    Watch the Introduction to AXC Family to find out more about the family.

  • In reply to Dylan Hubbard:

    Thank you, Dylan

    They are the loads the same. Is the chip broken due to external noise? I don't know.
    Have you ever had any of these symptoms?

    Best Regards
    June
  • In reply to park junseck:

    Hi June,
    Can you provide details about the problem you are seeing? All you have said is that your supply is 5V and your output is 4.4V... I don't know anything about your load circuit, supply, ground, or input signal.

    Do you have oscilloscope shots of the device that functions correctly and the one that does not?

    Right now your question is too vague to answer.


    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:

    Sorry I'm late. I'm going on a business trip, and I'll let you know the waveform tomorrow. Thank you for your consideration.
  • In reply to park junseck:

    Hi June,

    No worries!

    Check out our new AXC family of Voltage Translators! 

    Watch the Introduction to AXC Family to find out more about the family.

  • In reply to Dylan Hubbard:

    Dear Dylan Hubbard 

    I found an extremely bad guy and took it. . The last connection is 7 segment.( 74hc4094 -> 7 segments)

    Now another IC signal output is 4.4V . As I know it is a high to low level shifter, can you use it? 

    If not, can you recommend a low to high level shifter? It would be nice if the pinmap is the same ic

    Thank you 

    Best Regards

    June

  • In reply to park junseck:

    In addition, even if I input high (3.3V) on the STR line, the output part (FND_STR) shows that the signal drops instantaneously at 4.4V, not 5V high.
    I disconnected the part connected to FND_STR and checked the signal directly from the chip.
  • In reply to park junseck:

    Hi June,

    Could you give me more info on the scope shots you sent? I'm not sure what each channel is measuring.

    Check out our new AXC family of Voltage Translators! 

    Watch the Introduction to AXC Family to find out more about the family.

  • In reply to Dylan Hubbard:

    Dear Dylan Hubbard

    I think CD74HC4050 chip is made high to low level shifter. As I know it is a high to low level shifter, can you use it? (input 3.3V /output 5V)
    If not, can you recommend a low to high level shifter? It is a good idea to replace it with a low to high level shifter with the same pin map.

    Thank you
    Best Regards
    June
  • In reply to park junseck:

    Hi June,

    You can operate the way you are but be cautious of the VIH min spec being 3.15 V @ 4.5 V supply. You have to be above that voltage to have a guaranteed High input.

    Check out our new AXC family of Voltage Translators! 

    Watch the Introduction to AXC Family to find out more about the family.

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.