CD74HC4050: Is there marking correct ? (CD74HC4050)

park junseck

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

over 7 years ago

0 Dylan Hubbard over 7 years ago

TI__Mastermind 45145 points

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?

0 park junseck over 7 years ago in reply to Dylan Hubbard

Prodigy 80 points

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

0 Emrys Maier over 7 years ago in reply to park junseck

TI__Guru* 97016 points

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.

0 park junseck over 7 years ago in reply to Emrys Maier

Prodigy 80 points

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.

0 Dylan Hubbard over 7 years ago in reply to park junseck

TI__Mastermind 45145 points

Hi June,

No worries!

0 park junseck over 7 years ago in reply to Dylan Hubbard

Prodigy 80 points

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

0 park junseck over 7 years ago in reply to park junseck

Prodigy 80 points

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.

0 Dylan Hubbard over 7 years ago in reply to park junseck

TI__Mastermind 45145 points

Hi June,

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

0 park junseck over 7 years ago in reply to Dylan Hubbard

Prodigy 80 points

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

0 Dylan Hubbard over 7 years ago in reply to park junseck

TI__Mastermind 45145 points

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.

0 park junseck over 7 years ago in reply to Dylan Hubbard

Prodigy 80 points

Dear Dylan Hubbard ,
Yes I know what you are concerned about.
This time, I am going to change the part to SN74LV4T125PW. The spec does not seem to be a problem, but we need to create a new artwork. Thank you.

Best Regards
June

0 Dylan Hubbard over 7 years ago in reply to park junseck

TI__Mastermind 45145 points

Hi June,

I'm glad I could help. That device is meant for translation applications so you made a good choice.

0 park junseck over 7 years ago in reply to Dylan Hubbard

Prodigy 80 points

Thank you for your help.
I tested using an ESD gun. There is no problem.

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CD74HC4050: Is there marking correct ? (CD74HC4050)