This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

SN74HC164: What may cause output signal abnormal

Part Number: SN74HC164

Hi team,

It is nice to know you here. My customer used SN74HC164 to drive LED, schematic as below. When my customer input the 10101010 to LED_D0 pin, they find that sometimes QH is low at the 8th rising edge of CLK (three device found such issue). Could you please help share with me what may cause such an issue? Thanks.

BR,

Charles Lin

The right waveform of CLK/D0/QH

The wrong waveform of CLK/D0/QH