Overview

Replacement for CMOS RAM. Replaces the potted RTC device. See compatibility list below.

Problem with the potted RTC is that the battery will run flat and there may be no easy or clean way to fix the problem. Some systems will not boot with a flat battery.

Dallas Replacement essentially removes the potting and makes it easy to change the battery, ensuring that your hardware will hopefully stay functional for much, much longer with a simple battery change once in a decade.

Also included is a button for clearing the CMOS RAM.

Size-wise the Dallas Replacement is about 0.5mm wider and about 3mm taller when including the battery holder.

Compatibility list

• DS1285
• DS1287
• DS1287A
• DS12887
• DS12B887
• DS12887A
• M48T86
• HT12888A
• OEC12C887A
• DS14287 (See ordering information for special notes)
• DS17487 (See ordering information for special notes)

May be compatible with other parts as well. Please send me a message and I can see if I can find out if this would be compatible with your specific RTC.

Likely compatibility, but cannot be guaranteed

• DS12C887
• VT82885N

Normally, VT82885N has connection for a battery, but because Dallas Replacement comes with integrated battery, any external battery that accompanies VT82885N will not be used by the Dallas Replacement. Should still be compatible.

Ordering information

To further increase the chances of successful replacement, specify your current RTC and the pins will be trimmed accordingly. Choose untrimmed if you wish all pins left uncut; even the internally NC pins will be left uncut.

Special notes for DS14287

If you have DS14287, you must not purchase untrimmed option because that will not be compatible with DS14287. Make sure to select DS14287 as the Original RTC.

DS14287 comes without RAM clear button because DS14287 does not have support for it.

Special notes for DS17487

If you have DS17487, you must not purchase untrimmed option because that will not be compatible with DS17487. Make sure to select DS17487 as the Original RTC.

Installation tips

Update: ships now with a 24 pin IC socket.

I strongly recommend that you don't directly solder the part onto the motherboard, if possible. I recommend that you solder a 24 pin IC socket onto the motherboard, and plug the Dallas Replacement into that socket. This way, if anything goes wrong or doesn't work, you don't have to do any additional soldering.

What's included

• Includes fully assembled Dallas Replacement board and a CR1220 battery
• 24 pin IC socket

Pictured original Dallas RTC component is for reference only and not included