CD Datasheet, CD Stage Frequency Divider Datasheet, buy CD Data sheet acquired from Harris Semiconductor. SCHS Page 2. Page 3. Page 4. Page 5. Page 6. Page 7. Page 8. IMPORTANT NOTICE. Texas Instruments. all relevant TOSHIBA information, including without limitation, this document, the specifications, the data sheets and application notes.

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You shouldn’t be grounding it. I agree and would like to use your suggested circuit.

I’ve looked at that inner circuit diagram many times for various reasons, but I datashfet overlooked the issue with Pin 7! I found the attached circuit on the web. I will do a search on this site and google as well.

datashee The internal logic diagram for the IC explains the problem – see diagram below. Due to the low resolution of web images, I can not make out the text very well.

CD Datasheet, PDF – Alldatasheet

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CD4521 24-Stage Frequency Divider IC

Could test it out with that. The Maxim part is expensive because it is Temperature Compensated, so it has circuitry that is probably individually calibrated at several temperatures.

It is possible that this has already damaged the IC, to a greater or lesser extent. The reason i ask is because many times a person is looking for a one half Hertz oscillator but they ask for a 1Hz oscillator.

The solution there is to use a 50 percent duty cycle one-half Hertz oscillator. If you use the internal RC oscillator, you dont even need a crystal or external oscillator. With a 12F and a Hz watch crystal you could have a pretty accurate 1Hz timebase.

If we combine that with some divider ics, if again I understand correctly, we could have an oscilator that will rival the expensive TCXO for a lot, lot less. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Be only a matter, I should think, of adjusting the count in the code.

I wasn’t born with CD-series logic in hand so maybe I’m missing out something obvious How accurate do you need the timebase?

One Second Time Base | Electronics Forum (Circuits, Projects and Microcontrollers)

Therefore its output is now High. I have to admit that I like that crusty old scan quite a bit. I have several pics and a programmer and am somewhat aware of it’s possibilities in this case. I have a peculiar problem involving the CD frequency divider of which I use two in a redundant configuration as shown in my schematic snippet below:. I’ll look out for this issue from now on. There are lot’s of posters here who could supply it. Also, I varnished over the cut with nail polish to prevent accidental contact due to oxide growth.


Cheap, easy, and accurate. I think I will leave modifing a quartz clock timer for another day.

I could have used 60hz from the mains, but wanted to be independent of an external source. Can I use the 3 volt type in a five volt circuit? Is there a way to bring your circuit down to 5 volts? How do I know I am getting the newest, improved version of the ? It’s a very simple circuit and is not too sensitive to voltage variations, and accuracy can be adjusted to very very close to perfect if you have a frequency counter available.

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