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A NOT gate plugged into itself will send a pulse at 15hz rather than 30.
I have an emitter that emits a particle at its current position every frame, but I wanted the particles closer together. So I duplicated the emitter so I had 5 of them, and used a Lerp function to interpolate the previous position and current position of a tag by evenly spaced factors to get the particle emission positions as close together as I wanted. To do the interpolation, I needed to be able to have both the current and previous frame's position signal.
Wiring the signal through an Exclusive Gate gave me the delayed signal I wanted, but like I mentioned it uses global state which I want to avoid so I could have more than one of this same object in the scene.