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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CD Datasheet, PDF – Alldatasheet

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One Second Time Base. Thread starter jack Start date May 17, To create a one second time base, I went looking for this: After reading a bit to understand how these things work, I was thinking I could use another Can I use the 3 volt type in a five volt circuit? Hero Banned May 18, The simplist way I know of is to use a CD and a 4. I think I will leave modifing a quartz clock timer for another day.

Is there a way to bring your cd45211 down to 5 volts?

Digital-IC-Lexikon –

How about this datasheet? Is this a different ? I found the attached circuit on the web. Could I just not purchase an oscillator? I agree and would like to use your suggested circuit. Due to the low resolution of web images, I can not make out the text very well. Could you please post the component values? Diver Well-Known Member May 18, How accurate do you need the timebase? The Maxim part is expensive because it is Temperature Compensated, so it has circuitry that is probably individually calibrated at several temperatures.

One Second Time Base

That lets the circuit compensate for the temperature drift of the crystal, resulting in an oscillator that is far more accurate than a standard watch crystal. Datasbeet well adjusted watch crystal is accurate enough for most applications.

If that’s not good enough, a high frequency crystal can be more accurate if the temperature range is wide. Price depends on stability, and can be as good as 0. That’s cheap and low power compared to a Rubidium oscillator. Or you can use an external source. Most GPS receivers can give a 1 daatsheet per second output that is seriously accurate as it comes from the frequency standards in the satellites. You can also just divide the mains input by 50 or 60 to ratasheet you a 1 second pulse.

That is fairly inaccurate in the short term, but is corrected so that the long-term drift is zero, as many datasheeet clocks use the mains frequency as a reference. Your information is very interesting. As a beginner, reasonable accuracy is good enough for now.


I could have used 60hz from the mains, but wanted to be independent of an external source. I can breadboard other dividers to the circuit, etc. How do I know I am getting the newest, improved version of the ? I looked it up on Mouser, but their datasheet is dated many years ago. Maybe they dattasheet not update their datasheet. Hi there Jack, I would like to ask you an important question, but i’ll save that for later.

If you use the internal RC oscillator, you dont even need a crystal or external oscillator. If the code is adjusted for the particular RC oscillator on chip, the accuracy can datahseet very very good and be stable at room temperature too with only a tiny variation for plus and minus say 10 degrees C.


Not everyone likes or wants to use microcontrollers and i understand this, so another solution is to use an LM and a capacitor and a few resistors to make a 1Hz oscillator. 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.

It depends on how much accuracy you really need. Another solution is a I’ve actually used this solution though and it isnt too hard to build, and a high accuracy oscillator can be found if needed. LM oscillator is datasehet simplest and cheapest 1 cap, four resistors ce4521 maybe a potentiometer for perfect adjustment 2. Ok, now for the important question: Are you really after a 1Hz oscillator, or a 0. 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 difference is, if the oscillator is going to be used as a 1Hz time base for say a frequency counter, the frequency really needs to be one half Hertz, not 1Hz, because the period of time the 1Hz wave is high is only one have second and they really want 1 full second. The solution there is to use a 50 percent duty cycle one-half Cv4521 oscillator. Of course this may not apply to your application, but i thought i would ask just in case.

No problem if you dont really need this. Boncuk New Member May 18, The circuit I posted also has 0.

No, it’s 2Hz only, to get 1Hz you need another divider. I have several pics and a programmer and am somewhat aware of it’s possibilities in this case. After a bit of a learning curve, I got it to alternately blink two leds and was so happy I let it run for an hour.

I am a fair assembly and c programmer, but very low level when it comes to circuits and components. The pic stuff is something I will be working on in the future. I like Hero’s suggestion because, if I understand correctly, it is most likely as accurate as any watch oscillator and simple to build without the need of additional equipment such as a frequency counter which I do not have for calibration.


I do have a good scope once I learn to use it. Calibrate with that maybe? However, I think your LM suggestion bears serious looking at because the datasheet says it will operate over the full military temperature range.

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.

I do want one pulse per second.

Then i have to ask, why the problem? It’s gotta be one of the simplest programs you can do.

If you have an 8 pin PIC laying around you’re all set to go Hero Banned May 19, The MCU is still an option but it would need a crystal so the counter might be more convenient. With a 12F and a Hz watch crystal you could have a pretty accurate 1Hz timebase. You just copy timer0 bit 7 to an output pin with a prescaler. Edit, if you need the code just ask. There are lot’s of posters here who could supply it.

As colin55 said in post 2, just use the 1HZ output from a 1. Cheap, easy, and accurate. I can not help but smile.

This is where my inexpierence shows. I was thinking the pic may not be accurate enough and failed to realize that it could simply serve as a counter running off a crystal. Heck, I could even tweak the count to adjust it’s accuracy I’ll bet. Could test it out with that. Be only a matter, I should think, of adjusting the count in the code. So, sure, if someone would like to post a link for a tutorial or sample generic code of their favorite one for this C language please. I will do a search on this site and google as well.

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