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SN74HC04: SN74HC04DR Performance problem

yingjiao LI
Expert 1135 points
Part Number: SN74HC04

Hi

We have tested this product and found that the waveform is inconsistent, but the results of our two different screen printing tests are inconsistent. The screen printing of TI is normal, while the screen printing of printing is bad

Could you please help confirm the cause

thank you.

  • 0
    Guru 281530 points

    Both markings look valid 

    I do not understand your description. What are the input and output waveforms? I do not see a valid logic signal anywhere.

  • 0 in reply to Clemens Ladisch
    Expert 1135 points

    Hello, could you please help to confirm whether the power consumption of goods of Chinese origin is the same as that of goods of Mexican origin? Everything is normal when we use goods of Mexican origin, but abnormal when we use goods of Chinese origin, abnormal situation: the output voltage is pulled down by about 50%

  • 0 in reply to yingjiao LI
    Guru 281530 points

    There are different dies that can have different behaviours when you violate the recommended operating conditions, especially VIH, VIL, or ∆v/∆t. I suspect this is the case here. Please show the schematic of the test circuit, and specify exactly which waveforms are input and output signals.