I'm looking for a single IC that will give me at least three, four would be better, square waves at different frequencies, no more than 1Mhz. I need a rapid pull down to ground (fast rise and fall times; a fast extinguishing of the pulse; the output pulse should come as close as possible to the supply voltage, and as close as possible to ground), 50% duty cycle is fine, within 5% over temperature, and output of 100mA max, even 1mA would be ok, capable of being powered at 10V. The output pulse should have The circuit should be cheap, readily available parts, easy to put together. The 558 timer comes to mind, but cannot be configured as an astable, although KJ6EAD on this forum claims to have done that. Not readily available, either. The 4093 looks promising. Any other ideas or comments?
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