Part Number: SN74LVC1G125
I didn't notice a minimum application circuit for SN74LVC1G125 in the datasheet, does it have one? Cuz when I test it separately( with a 0.1uF bypass capacitor near the power pin ), the output didn't go as I thought.
I powered SN74LVC1G125 with 3.3V, and connected /OE pin to GND. The results are as followed:
When the input is 3.3V, the output is 3.3V, this is correct.
but when the input is 0V, the output is about 2.4V. doesn't it should be 0V?
I've tested several SN74LVC1G125s and the results are all the same. They work perfectly fine in a pre-made PCB, so I must missed something.
please tell me what I've been missing, thank you in advance.
Hello, and welcome to the forums!
Yes, the output will be 3.3V when the input is 3.3V (assuming the supply is 3.3V), and the output will be 0V when the input is 0V (assuming GND is 0V).
Can you provide a schematic for your test circuit and/or an image of the circuit?
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In reply to Emrys Maier:
Hi and thanks for your time,
I drew a PCB with a SN74LVC1G12x circuit shown in the schematic below:
but it won't work. So I simplified the circuit and used a part of the PCB to pinpoint the problem :
and I found that the output is about 2.4V when the input is connected to GND. Can the circuit above work? If so, why the output wasn't 0V?
In reply to user5224603:
The images did not attach; please try again.
In reply to Clemens Ladisch:
sorry, I've re-posted the images.
Is there something else on TTL_DATA that could pull the line high?
What happen when you replace the SN74LVC1G125 with a 22 Ω resistor between GND and Y?
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