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Clock frequency divider circuit (divide by 2) using D flip flop

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tarunkumartars:
how can we divide the frequency of (5MHz) with 50% duty cycle to half its frequency  using  D flip flops in hardware ?
Thank you

MarkF:


You can also use 4-bit counters to divide by other powers of 2 (SN74LS160 and SN74LS190 series).
These do not need to be LS versions.  Could be CMOS if you need higher voltages.

tarunkumartars:
 what would be output (Q) when there is no clock given ( initial condition when the Flip flop is just on)? And even negative edge trigger work as well right?

wraper:

--- Quote ---what would be output (Q) when there is no clock given ( initial condition when the Flip flop is just on)?
--- End quote ---
Unless you make power on delay for CLR, output on power on is undefined.

--- Quote ---And even negative edge trigger work as well right?
--- End quote ---
It acts on positive edge. How is it supposed to divide anything while working for both edges?

wraper:

--- Quote from: MarkF on November 13, 2019, 01:27:22 pm ---These do not need to be LS versions.  Could be CMOS if you need higher voltages.

--- End quote ---
LS series should die already. Even if you use 5V, there is little reason to use LS, not 74HC74. For higher voltages it would be CD4000 series.

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