Electronic – (Reasonably) accurate 1Hz clock generator

battery-operatedclockflipflop

I would like your advice on components before I purchase anything.

I am going to make a digital 24hr clock using probably JK flip flops/multiplexors with 7 segment displays. But it must be battery-operated.

Is using a 32kHz quartz crystal, a good way of producing a 1Hz clock signal for my FF's? I know I will have to do some frequency division (2^15) with FF's.

If so, is there an IC I can buy that produces a 1Hz output signal? If anyone knows any part numbers off the top of your head, it would be good if you could share them.

Does the quartz crystal require any other circuitry to operate?

I haven't used the mentioned component before, sorry if the questions are silly.

Thanks

Best Answer

Is using a quartz crystal 32kHz a good way of producing a 1Hz clock signal for my FF's

Yes, that is the way to do that. You probably haven't met the 4060 CMOS logic chip yet because it can do most of what you need.

Look at page 8 for how it can use a Crystal as the input clock. It will divide down that clock with a series of flip-flops by \$2^{14}\$ so you'll get 2 Hz form a 32768 Hz (watch) crystal. So add another divide-by-2 and you're done.

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