TLV3201-Q1: Propagation delay explanation

Hello Nicolas,

Prop delay is generally defined as the time between the 50% point of the input pulse to the 50% point. The input pulse is usually crossing the reference threshold at 50%.

Theoretically, your first example is what will happen. The pulse will be delayed by 40ns.

However, because the pulse width is less than the prop delay, the output may have some distortion and will require increasing input drive as the input sensitivity is rolling off starting at 40ns. So you will need greatly increasing input amplitude to get the output to trigger - *if* it even triggers.

So you really do not want to try to detect pulses less than the prop delay plus the risetime and falltime (pulsewidth > (tp+tr+tf) )

If you need to detect 20ns, use the TLV3501-Q1, which is <5ns and also has internal hysteresis to clean up the edges.