74**14
From BEAM Robotics Wiki
Hex Inverting Schmitt Trigger (6-gate inverter chip with hysteresis).
This chip is often considered the heart of Nv net technology, since each Schmitt inverter is individually-accessible (and so each, along with a capacitor, can be turned into a Nv neuron).
See the 74*04 (which is the same chip, but with "vanilla" inverters, rather than Schmitt inverters). See also the 74*240 (which is very similar to a 74*04, but with enables on outputs).
Note that Schmitt triggers can't easily be used in suspended bicore implementations (so save your 14s for non-suspended designs). As for flavors of 74*14 chips, a 74HCT14 Nv net has a longer pulse duration (given the same resistors and capacitors) than a Nv net built on a 74AC14 or 74HC14. Meanwhile, for ultra-low-power 5V - 12V applications for Nv, Nu, or oscillator circuits, use a 74C14.
Also see:
- BEAM ICs
- CMOS section of the 7400_Families article.
[edit] Datasheets
The 74AC14 is available from long time BEAM supporter Solarbotics.
