For all devices, the date at the end of the monthĭS12885, DS12887, DS12C887 DS1285 DS1287. ![]() The DS12C887 adds a century byte at address 32h. Clock Accuracy for DS12887, DS12887A, Rev 0 6/05 Real-Time Clock The DS12885, DS12887, and DS12C887 real-time clocks (RTCs) are, DS12887 integrates a quartz crystal and lithium energy source into a 24-pin encapsulated DIP package. Text: / Dallas Direct! at 1-88, or visit Maxim's website at 1 DS12885/ DS12887, Dallas Real-Time Clocks for more detailed information. Text: Ablebond Au / 1.3 mil UL 94-V0 NA Date Code Range: 0713 DATE CODE : 0713 to 0713 LOT, Ablebond Au / 1.3 mil UL 94-V0 NA Date Code Range: 0914 DATE CODE : 0914 to 0914 LOT, WHISKERS App Notes > REAL-TIME CLOCKS Keywords: DS1287, DS12887, HT12888, HT12888A, real time clock, Replacing the DS1287/ DS12887 Real-Time Clock in a Personal Computer Abstract: This application note describes the replacement of the DS1287/ DS12887 real-time clock (RTC) or "CMOS clock" in a personal, on, it is not the RTC. Text: -100 JAN '99 LPM MONITOR - DALLAS DEVICE DS1230Y REVISION DATE CODE LOT NUMBER PINS A1 9844 105760 26, '99 MONITOR-DALLAS DEVICE DS12887 REVISION DATE CODE LOT NUMBER PINS A2 9849 105030 24, DS12887 REVISION DATE CODE LOT NUMBER PINS C1 9909 107432 24 PACKAGE Module w/Bent Frame WIDTH, DATE CODE LOT NUMBER PINS E 9918 109343 80 PACKAGE SipStick WIDTH 0 ASSEMBLY SITE Dallas NO OF, RELIABILITY MONITOR DS1225AB-200 FEB '98 MONITOR-DALLAS DEVICE DS1225A REVISION DATE CODEĭS1225AB-200 DS1225A MIL-STD-883-2003 MIL-STD-883-2016 60C/90% DS1230AB-200 DS1230HOURĪbstract: JESD22-B102 maxim assembly of code dallas date code ds12887 JESD22-B105 They clearly weren't expecting anyone to still be using these machines 40 years after production.Dallas date code ds12887 Datasheets Context Search Catalog Datasheet This wouldn't be an issue if it weren't for the fact that the chip in use, the Dallas DS12887, has the battery embedded inside the chip itself instead of on the motherboard. Hence the need for that coin cell battery.ĭEC unfortunately designed the Celebris series with the RTC chip soldered directly to the motherboard. Similar to the RAM on the motherboard, CMOS RAM is also volatile and will lose any data it stores if it loses power. CMOS is a type of circuit design common in memory chips and inside the RTC chip is a small amount of memory (CMOS RAM) that is used to store configurations for the BIOS. If you're unfamiliar with real-time clocks (RTC) well they're often conflated with CMOS which is contained within the chip itself. I just need to replace the coin cell battery. Do you remember that circular looking battery on your motherboard? This is what powered the memory to store your BIOS settings when the computer was off. So after many hours of searching on eBay I found and purchased a DEC Celebris 466 with the disclaimer that the BIOS would not maintain it's settings after powering down. ![]() ![]() This all started in one of the many Covid-19 lockdowns we experienced - in search of a new source of entertainment, I decided I wanted to play some old computers games with the caveat that they had to be played on original hardware for full nostalgic factor.
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