cmos programable "divide by N"

[jchunterelectric]

Anyone out there have experiance with the CD4059AE?
I'm having trouble understanding the DATA sheet. I am building a Hydrogen generator and there are two basic circuits. One drives the electrodes and the other drives a coil. The coil is supposed to have a frequency that is 1000 times less than the electrodes. Maybe the "Divide by N" is the wrong component. Any suggestions?

 

[ericgibbs]

Anyone out there have experiance with the CD4059AE?
I'm having trouble understanding the DATA sheet. I am building a Hydrogen generator and there are two basic circuits. One drives the electrodes and the other drives a coil. The coil is supposed to have a frequency that is 1000 times less than the electrodes. Maybe the "Divide by N" is the wrong component. Any suggestions?

hi jc,
Can you post a drawing, showing the 4059 divider section, its difficult to guess what the problem may be from your description.

To attach a drawing use the 'Manage Attachments' button lower down the 'reply' window.

 

[Optikon]

Yes, please add more detail.. if you need divide by 1000, a standard binary counter won't work because your ratio is not a power of 2.

2^10 = 1024. If that is an acceptable division, then your circuit can be made simpler. If you need precisely 1000 then it can be done but it involves more parts potentially.

 

[crutschow]

The 4059 can indeed be programmed to divide by 1000 (actually any number up to 15,999).

Be aware, however, that the output count not a square-wave but is one clock pulse wide. Thus if you use a 1000Hz clock and divide it by 1000 you will get a 1ms pulse once per second. If you need a square-wave output you can set the counter to divide by 500 and run the output through a toggle flip-flop. This will divide by 2 with 50% duty-cycle to give a total division of 1000 with equal high and low time.

But as Optikon noted if you you can live with a 1024 divide ratio then it's simplier just to use 10-bits of binary count (use three 4-bit counters and take the output from the 10th bit). This will also give you a square-wave output.

 

[jchunterelectric]

Thank you all for your imput. I do not have to have an exact division. I believe that the division of 1024 would work just fine. As soon as I can get my drawing in the proper format I'll post it.

 

[phil7890]

Suppose you use a 74HCT4060 or 74HCT4020 for this divide by 1024 function. Be cautious here because a Texas Instruments TI 74HCT4060 datasheet has different output frequency labels/texts compared to a Phillips/NXP Semiconductor 74HCT4060 datasheet. Similarly, a TI 74HCT4020 datasheet has different output frequency/labels compared to a Phillips/NXP 74HCT4020 datasheet. Just look at pin 1 of each datasheet/chip. One says Q12 and the other datasheet says Q11. But they're both the same chips (same function/features internally)... it's just the datasheet that may confuse you when you try to pick the correct Q-something pin to use for your circuit.