Electronics > Beginners
Flipflop is unstable
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tggzzz:

--- Quote from: ratatax on August 06, 2019, 10:38:47 pm ---Thank you all for the ideas, actually I need quite fast parts even if the signal is not of high frequency, since it's used as a 'frame indicator' for a much faster signal (6Mhz). For some reason, using a classic 74HC74 isn't fast enough even if it's rated for more than 20mhz if I remember correctly. I had a delay of about 1 clock @ 6Mhz with it  :o

--- End quote ---

The clock period is completely irrelevant. All that matters is the transition time. That is the "dt" I mentioned above.

Do the arithmetic.
fourfathom:

--- Quote from: ratatax on August 06, 2019, 10:38:47 pm ---Thank you all for the ideas, actually I need quite fast parts even if the signal is not of high frequency, since it's used as a 'frame indicator' for a much faster signal (6Mhz). For some reason, using a classic 74HC74 isn't fast enough even if it's rated for more than 20mhz if I remember correctly. I had a delay of about 1 clock @ 6Mhz with it  :o

--- End quote ---
This is one case where a synchronous divider can help. With your original ripple divider you have two clk-q delays in series. A synchronous divider will have just one clk-q delay.
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