CD4521 DATASHEET PDF

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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As mentioned in the excellent comment from brhansthe problem is the connection of pin 7 to Gnd V SS on your schematic. The Maxim part dstasheet expensive because it is Temperature Compensated, so it has circuitry that is probably individually calibrated at several temperatures. Home Questions Tags Users Unanswered. What could be causing this?

You just copy timer0 bit 7 to an output pin with a prescaler. 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. It is possible that this has already damaged the IC, to a greater or lesser extent. Can I use the 3 volt type in a fd4521 volt circuit? Potentiometer Questions Started by norbss Yesterday at Heck, I could even tweak the count to adjust it’s accuracy I’ll bet.

Of course this may not apply to your application, but i thought i would ask just in dataasheet. I agree and would like to use your suggested circuit. Or you can use an external source. Just saying hello Started by MichaelaJoy Yesterday fatasheet 6: Below is the relevant part of my PCB layout – your wisdom will be much appreciated! 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. I am a fair assembly and c programmer, but very low level when it comes to circuits and components.

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Thread starter jack Start date May 17, Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. 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: If you are lucky, any internal damage has been confined to the driver for pin 7, which you aren’t using.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. 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.

Started by fastline Yesterday at 8: If you use the internal RC oscillator, you dont even need a crystal or external oscillator. It may also have damaged one or both of these ICs. LM oscillator is the simplest and cheapest 1 cap, four resistors and maybe a potentiometer for perfect adjustment 2. I do want one pulse per second. Post as a guest Name. By continuing to use this site, you are consenting to our use of cookies.

However, I think your LM suggestion bears serious looking at because the datasheet says it will operate over the full military temperature range. The simplist way I know of is to use a CD and a 4. Thank you for the analysis and for taking the datxsheet to prepare such daasheet exhaustive answer!

CD Frequency Divider – CD Stage Frequency Divider IC – Robomart

Could you please post the component values? Sign up using Facebook. You can also just divide the mains input by 50 or 60 to give you a 1 second pulse.

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I was thinking the pic may datasbeet be accurate enough and failed to realize that it could simply serve as a counter running off a crystal. You shouldn’t be grounding it.

If the code is adjusted for the particular RC oscillator on chip, the accuracy can be very very good and be stable at room temperature too with only a tiny variation for plus and minus say 10 degrees C.

I’ve looked at that inner circuit diagram many times for various reasons, but I totally overlooked the issue with Pin 7! Be only a matter, I should think, of adjusting the count in the code. Cheap, easy, and accurate. The solution there is to use a 50 percent duty cycle one-half Hertz oscillator. You must log in or register to reply here.

Pin 7 is an output.

CD Datasheet, PDF – Datasheet Search Engine

Not everyone likes or wants to use microcontrollers and i understand this, so another solution is to use an LM and datashheet capacitor and a few resistors to make a 1Hz oscillator. Forums New posts Search forums. I do have a good scope once I learn to use it. 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:.

One Second Time Base

It depends on how much accuracy you really need. Hi there Jack, I would like to ask you an important question, but i’ll save that for later. I can not help but smile. Diver Well-Known Member May 18, I will do a search on this site and google as well. Also, I varnished over catasheet cut with nail polish to prevent accidental contact due to dataaheet growth.

Could test it out with that.