SN74LVC14A: The input impedance for SN74LVC14A

Zhang Liang

Genius 4435 points

Part Number: SN74LVC14A

Hi,

Please help to check why this impedance by Pin1 to GND is 300ohm, and we consider it is the 10Kohm, thanks.

0 Albert Xu1 over 2 years ago

Hi Zhang,

Can you help to clarify your question? Are you asking if having a 10K resistor is OK for this device? Or where are you getting this 300 Ohm value?

0 Zhang Liang over 2 years ago in reply to Albert Xu1

Genius 4435 points

Hi Albert,

The R414 is the 10Kohm, and the 300ohm is measuere from pin1 to DGND, thanks.

0 Clemens Ladisch over 2 years ago in reply to Zhang Liang

Guru 318700 points

At least one of the three components (R414, C148, IC29) is damaged. You have to desolder them to find out which one.

The most likely cause would be overvoltage.

0 Zhang Liang over 2 years ago in reply to Clemens Ladisch

Genius 4435 points

Hi Clemens,

Thanks for your kindly support, I will check the issue soon.

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