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NA555: output waveform is abnormal

Part Number: NA555

Hi team,

The output waveform is abnormal, related to the pulldown/pullup resistance added at the output pin

At the output, add a pull-down resistance of 5.1k. The output waveform has a step:

change to pullup resistor of 1k to the output. The output waveform has a drop pit:

Is it related to its output circuit structure? Is there a way to eliminate it

Best Regards,

Amy Luo