SN74LVC07A: the reason of no output

Hui Cao22

Part Number: SN74LVC07A

Tool/software:

Input voltage is normal, no output after access to the circuit, what will cause no output?

The schematic diagram is as follows

0 Clemens Ladisch 11 days ago

Guru 261430 points

"Normal" does not tell us anything.

What are the voltages you are measuring at DSP_FAULT, DSP_FAULT_OUT, and FAULT_OUT_3.3?

0 Hui Cao22 11 days ago in reply to Clemens Ladisch

DSP_FAULT：3.3V,

DSP_FAULT_OUT：0, and

FAULT_OUT_3.3：3.3V

0 Clemens Ladisch 11 days ago in reply to Hui Cao22

Guru 261430 points

Does the output change when DSP_FAULT goes low?

What is the marking on the chip?

0 Hui Cao22 10 days ago in reply to Clemens Ladisch

0 Clemens Ladisch 10 days ago in reply to Hui Cao22

Guru 261430 points

The marking looks correct.

If the output is low when the input is high, then the device must be damaged. Try another chip.

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