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

Also, as I mentioned, these ICs might already have been partially damaged, and require replacement if you want to be confident of their future behaviour and reliability.

The pic stuff is something I will be working on in the future. I wasn’t born with CD-series logic in hand so maybe I’m missing out something obvious The temperature is the same between the two units and they both operate reliably so far.

That will cause a significant current to flow through the IC and also cause its temperature to rise, as you measured. 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.

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CD4521 24-Stage Frequency Divider IC

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I have to admit that I like that crusty old scan quite a bit. I cut some traces and true enough, the temperature is now close dd4521 ambient at all times!

Is this a different ? Hi there Jack, I would like to ask you an important question, but i’ll save that for later. Also, I varnished over the cut with nail polish to prevent accidental contact due to oxide growth. A well adjusted watch crystal is accurate enough for most applications. Boncuk New Member May datasheet, I’ve actually used this solution though and it isnt too hard to build, and a high accuracy oscillator can be found if needed.

If you use the internal RC oscillator, you dont even need a ratasheet or external oscillator.

CDB Datasheet(PDF) – TI store

After reading datashet bit to understand how these things work, I was thinking I could use another I’ve edited the original image from the TI datasheet that you linked, to remove extraneous parts. This is where my inexpierence shows. It’s gotta be one of the simplest programs you can do. The MCU is still an option but it would need a crystal so the counter might be more convenient.

I looked it up on Mouser, but their datasheet is dated many years ago.

Welcome datasheeet our site! Could I just not purchase an oscillator? Then i have to ask, why the datasneet Just saying hello Started datasheey MichaelaJoy Yesterday at 6: Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Therefore, after each going through an inverter, the two inputs to the NAND gate in the diagram are both High, and its output is Low. Below is the relevant part of my PCB layout – your wisdom will be much appreciated!


How do I know I am getting the newest, improved version of the ? Home Questions Tags Users Unanswered. To create a one second time base, I went looking for this: Note that the TI datasheet is a scan of an earlier Harris Semiconductor datasheet, so it does not have the high resolution of typical modern datasheets.


It may also have damaged one or both of these ICs. Cheap, easy, and accurate.

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 agree and would like to use your suggested circuit. Maybe they did not update their datasheet.

Sign up using Email and Password. However, I think your LM suggestion bears serious looking at because the datasheet says it will operate over the full military temperature range. Slightly clearer internal logic diagrams of the IC are available in the datasheets from: Edit, if you need the code just ask. By continuing to use this site, you are consenting to our use of cookies. As mentioned in the excellent comment from brhansthe problem is the connection of pin 7 to Gnd V SS on your schematic.