Hello Team,
Can you share the internal input and output circuit structure? Is it push-pull structure? is there pull-up resistors? Thanks.
Regards,
Nanfang
Hello Nanfang,
The device you are using works on a the 3.3V LVTTL threshold level as shown in the image below.
While the switching threshold is typically 1.5V, as shown, the threshold could theoretically exist anywhere between 0.8 an 2V.
If your signal is non-monotonic between VIL and VIH, this is not going to be ideal, as the device could have oscillations or multiple switches on the output of the device.
Furthermore, it is best to keep in mind that the input transition rate of 10ns/V needs to be met as a recommended operating condition. In other words the input signal needs to rise from GND to 3.3V in less than 33ns. If you have a non-monotonic signal, that would seem to suggest to me that it is not rising quickly. If the input isn't rising quickly, then the output is likely to oscillate anyway. Please refer to the following app note:
http://www.ti.com/lit/wp/slla364a/slla364a.pdf
If you have slow rising inputs into this device, then it is best if you use schmitt trigger input devices to help clean up the slow rising signal. A schmitt trigger would also help to reduce any oscillations or retriggering that could happen during a non-monotonic signal. Based on how the input signal looks, it would be best to use a schmitt trigger that has a hysteresis which is defined to be larger than the noise on the signal.
Does this make sense? Please let me know how I can help further.
Best,
Michael
