hey westfw thats a great idea.
74LV132 data sheets from Phillips HTTP 301 This page has been moved and from NXP http://www.nxp.com/documents/data_sheet/74LV132.pdf and even TI http://focus.ti.com/lit/ds/symlink/sn74lv132a.pdf show logic symbols with an independent Schmitt trigger for each input. DigiKey carries NXP and TI. Apparently TI does not supply these as DIPs but in the interest of science I'll spring for a SOIC adapter just to prove TI version of 74LV132 doesnt suffer the same problem as their 4093.
Then I can add the TI 74LV132 data to my graph and finally post a credible response to TI's snarky dismissal of my complaint on the their support site. ]
BTW The frequency depends also on the hysteresis, wider band = lower freq, thus the significant difference in the free running rate between manufacturers. But (for the chips that "work right") the graph is absolutely flat which is what DCDW needs for the "swarm of motes" using "sensor plus ID" mode.