Interesting:
| Delay (us) | Jitter (ns pk) | 5.7 | 460 | 2.92 | 170 | 1.45 | 26 | 0.72 | < 10
Input is a linear capacitor charging slope. Delay is the time taken from the reset voltage (about 0.5V) until crossing the input threshold. Schmitt trigger is 74HC7014, a very handy little chip.
Actually, it's not little, they don't make a TSSOP. But SOIC is good enough.
Anyway, the jitter seems to go up much faster than proportional. Or, that it has a threshold.
Tim