Speakerguy
Active Member
There are CMOS 555 timers that claim astable operation to 3MHz. I've used one up to 1MHz successfully and the signal looked good, I don't doubt the 3MHz claim. The part # was LMC555.
ETA: The cap size for this frequency range is teeeny. I was a dummy and put the traces to my 22pf cap over a ground plane. The added capacitance threw off all the normal 555 equations and I had to tweak capacitance and resistances in the 555 ckt by hand.
ETA: The cap size for this frequency range is teeeny. I was a dummy and put the traces to my 22pf cap over a ground plane. The added capacitance threw off all the normal 555 equations and I had to tweak capacitance and resistances in the 555 ckt by hand.