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I'm measuring a propagation delay and transition delay of a 74HC86 chip. I setted somewhat high frequency square-wave signal(100kHz) for Input 1. Input 2 was connected to VCC. I tried to measure delays, but oscilloscope confused me because of attenuation.
As you see in the picture, when the falling edge occurs(Yellow plot is the input of the 74HC86, and green plot is the output of the 74HC86), something like damping is shown and I'm frustrated because I don't know how to set the interval of measurement.
I searched some questions and I acknowledged that main cause is the L or C components in my probe, the breadboard, or my wire. However, I think this cannot be entirely disappeared, and I want to get the transition delay.
Is it okay to get the 0.1Vcc and 0.9Vcc as interval for transition delay? If it isn't, have to I modify the measurement points?
The link of datasheet of the chip is at below:
https://assets.nexperia.com/documents/data-sheet/74HC_HCT86.pdf
You can refer about the delays at page 7.
- I don't have a USB flash, please understand about this.