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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I looked it up on Mouser, but their datasheet is dated many years ago. Calibrate with that maybe?
Are you really after a 1Hz oscillator, or a 0. The circuit I posted also has 0. As colin55 said in post 2, just use the 1HZ output from a 1. I found the attached circuit on the web. Thread starter jack Start date May 17, I agree and would like daatsheet use your suggested circuit. No problem if you dont really need this. One Second Time Base. Potentiometer Questions Started by norbss Yesterday at How accurate do datashfet need the timebase?
Of course this may not apply to your application, but i thought i would ask just in case. Articles Top Articles Search resources. That is fairly inaccurate in the short term, but is corrected so that the long-term drift is zero, as many electric clocks use the mains frequency as a reference. Pin 7 is an output.
Hero Banned May 19, You can also just divide the mains input by 50 or 60 to give you a 1 second pulse. I’ll look out for this issue from now on. The internal logic diagram for the IC explains the problem – see diagram below.
CD Frequency Divider – CD Stage Frequency Divider IC – Robomart
That’s cheap and low cd4512 compared to a Rubidium oscillator. A different IC datasheet mentions an absolute maximum output current of 10mA, which you will be exceeding.
Ok, now for the important question: Media New media New comments Search media. That will cause a significant current to flow through the IC and also cause its temperature to rise, as you measured.
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. Edit, if you need the code just ask. Below is the relevant datazheet of my PCB layout – your wisdom will be much appreciated! I have the Hi-Tech C compiler student edition.
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. The MCU is still an option but it would need a crystal cd45211 the counter might be more convenient. I will do a search on this site and google as well. What could be causing this? How about this datasheet?
There are lot’s of posters here who could supply it. However, this extra current will be less than in the case below. Then i have to ask, why the problem?