The DS, DS, and DS12C real-time clocks (RTCs) are designed to be direct replacements for the DS and DS Data Sheet. Subscribe. DS datasheet, DS circuit, DS data sheet: DALLAS – Real Time Clock,alldatasheet, datasheet, Datasheet search site for Electronic Components . DS Datasheet, DS PDF, DS Data sheet, DS manual, DS pdf, DS, datenblatt, Electronics DS, alldatasheet, free, datasheet.

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DS1287 – DS1287 Real Time Clock Datasheet

Now the battery is dead, configuration is lost after relatively short time again and you get error-codes constantly. A really new, fresh and unused chip is hard to get. Even its successor DS is pretty hard to get and darn expensive.

At that point you wish you could add an external battery. There are no provisions for one. Have a look at the graphics below. Possible Results Reworked chip inside a Mod. Note the battery holder! Curiosity killed that cat. After the dust cleared On March, 23rd, Chris xrisl [at] yahoo. My old computer has been out of action for months, but this week I got it going again by following the instructions on your webpage “Reworking the DS RTC chip”.

Without that webpage, I would never have thought of repairing it like that!

DS Datasheet(PDF) – Dallas Semiconductor

So you have my thanks and gratitude for putting that idea on the web. Incidentally, my computer is an Compaq N, which seems to date from about I used an iron file that was about the exact width I needed and just slowly went back and forth about 50 times until I saw the metal and then used sandpaper the rest of the way.


Soldered and used a CR battery with holder on top of the Worked like a charm and would like to thank you and I am very grateful I stumbled on your web site. I could not have gotten my Compaq DeskPro e back to clock life back without you! William Walsh did the DS-Rework to get an external battery to it as well. On January, 7th, Emmanuel Da Piedade emmanuel.

I just want to tell you that I succesfully used your DS rework How-to. You did a great job!

You can see the result here sorry, the text is in french: Here Best Regards Emmanuel. Then circumstances kept me from working with it until now A couple weeks ago when I datasheett got around to hooking it up I discovered that the RTC chip was dead.

Can you imagine my amazement and relief when I discovered your web site describing the DS rework process. I used a medium sized flat file I soldered a 22 solid wire to each of the battery holder pins, then glued the holder to the DS case using model datashest plastic cement.

Attached the two wires to the exposed pins and put the new lithium cell in the holder.

It works like a champ! For anyone who attempts this mod It sets too fast! Go with the hot glue. Thank you very much for putting this mod on your web site. I appreciate it greatly. Howe dougnflo [at] comcast [dot] net Kalamazoo, Michigan, U. Then the battery and xtal are placed atop da1287 the chip, connected to the pins and everything is covered with a pretty rigid protective compound.


DS Datasheet Dallas Semiconducotr pdf data sheet FREE from

All described modifictions apply to this chip as well. The only things you need to do is: If you have a multimeter test the voltage on pins 16 and 20 before and after.

The 0V-reading tells you that you successfully disconnected the battery. Care for the polarity!

Don’t ever solder directly on a coin-style Li-Cell. It won’t do it no good and may result in early death of that part due to excessive internal heating.

Most likely you won’t get a wire soldered properly to it. The case is usually pretty much “solder-resistive” because of the anti-corrosion plating. Don’t use rechargeable batteries. These are intended for short-term use with strong charge and discharge intervals – not for long-term storage with a comparatively small discharge rate. The daily self-discharge rate on some rechargeables is higher than the current taken by the RTC.

Should work like a charm.