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Real Time Clocks Dallas Semiconductor


Year 2000-Compliant Clocks
Part
Number		 Power
Options
(Volts)		 Clock
Format		 Calendar
Format		 User
RAM
(Bytes)		 Features NV SRAM
Control		 Optional
Industrial
Grade		 Serial
Number		 Bus
Type		 Chip/
Module/
PowerCap*
DS12C887 5STDY2K113A,CR


Parallel/MuxedM
DS1500 3.3/5STDY2K256A,KS,WU,WD,UR

Parallel/BytewideC
DS1501 3.3/5STDY2K256A,KS,WU,WD,UR

Parallel/BytewideC
DS1510 3.3/5STDY2K256A,KS,WU,WD,UR

Parallel/BytewideM
DS1511 3.3/5STDY2K256A,KS,WU,WD,UR

Parallel/BytewideM
DS1553 3.3/5STDY2K8KA,WD,UR


Parallel/BytewideM,P
DS1554 3.3/5STDY2K32KA,WD,UR


Parallel/BytewideM,P
DS1556 3.3/5STDY2K128KA,WD,UR


Parallel/BytewideM,P
DS1557 3.3/5STDY2K512KA,WD,UR


Parallel/BytewideP
DS1678 5STDY2K32A,ER


2-WireC
DS1685 3/5STDY2K114+128A,P,U,KS,WU,RC
Parallel/MuxedC
DS1687 3/5STDY2K114+128A,P,U,KS,WU,RC
Parallel/MuxedM
DS1688 3/5STDY2K114A,P,U,KS,RC,VC,PC
Parallel/MuxedC
DS1689 3/5STDY2K114A,P,U,KS,RC,VC,PC Parallel/MuxedC
DS1691 3/5STDY2K114A,P,U,KS,RC,VC,PC
Parallel/MuxedM
DS1693 3/5STDY2K114A,P,U,KS,RC,VC,PC
Parallel/MuxedM
DS17285 3/5STDY2K114+2KA,P,U,KS,WU,RC
Parallel/MuxedC
DS17287 3/5STDY2K114+2KA,P,U,KS,WU,RC

Parallel/MuxedM
DS17485 3/5STDY2K114+4KA,P,U,KS,WU,RC
Parallel/MuxedC
DS17487 3/5STDY2K114+4KA,P,U,KS,WU,RC

Parallel/MuxedM
DS17885 3/5STDY2K114+8KA,P,U,KS,WU,RC
Parallel/MuxedC
DS17887 3/5STDY2K114+8KA,P,U,KS,WU,RC
Parallel/MuxedM
DS1742 3.3/5STDY2K2K



Parallel/BytewideM
DS1743 3.3/5STDY2K8K



Parallel/BytewideM
DS1744 3.3/5STDY2K32K
Parallel/BytewideM,P
DS1746 3.3/5STDY2K128K



Parallel/BytewideM,P
DS1747 3.3/5STDY2K512K



Parallel/BytewideM,P
* Module includes embedded battery and 32.768 kHz crystal.
Watchdog Timekeepers
Part Number Power
Options
(Volts)		 Clock
Format		 Calendar
Format		 User RAM
(Bytes)		 Features NV SRAM
Control		 Optional
Industrial Grade		 Bus Type Chip/
Module/
PowerCap*
DS1500 3.3/5STDY2K256A,KS,WU,WD,UR Parallel/BytewideC
DS1501 3.3/5STDY2K256A,KS,WU,WD,UR
Parallel/BytewideM
DS1510 3.3/5STDY2K256A,KS,WU,WD,UR
Parallel/BytewideC
DS1511 3.3/5STDY2K256A,KS,WU,WD,UR

Parallel/BytewideM
DS1543 3.3/5STDSTD8KA,WD,UR

Parallel/BytewideM,P
DS1553 3.3/5STDY2K8KA,WD,UR

Parallel/BytewideM,P
DS1554 3.3/5STDY2K32KA,WD,UR

Parallel/BytewideM,P
DS1556 3.3/5STDY2K128KA,WD,UR

Parallel/BytewideM,P
DS1557 3.3/5STDY2K512KA,WD,UR

Parallel/BytewideM,P
DS1284 5STD+hhSTD50A,WD
Parallel/BytewideC
DS1286 5STD+hhSTD50A,WD
Parallel/BytewideM
DS1386 5STD+hhSTD8K,32KA,WD

Parallel/BytewideM,P
DS1486 5STD+hhSTD128KA,WD

Parallel/BytewideM,P
NV Timekeeping RAM
Part Number Power
Options
(Volts)		 Clock
Format		 Calendar
Format		 User RAM
(Bytes)		 NV SRAM
Control		 Optional
Industrial
Grade		 Bus Type Module/
PowerCap*
DS1642 5STDSTD2K

Parallel/BytewideM
DS1643 5STDSTD8K

Parallel/BytewideM,P
DS1644 5STDSTD32K

Parallel/BytewideM,P
DS1646 5STDSTD128K

Parallel/BytewideM,P
DS1647 5STDSTD512K

Parallel/BytewideM,P
DS1742 3.3/5STDY2K2K

Parallel/BytewideM
DS1743 3.3/5STDY2K8K

Parallel/BytewideM,P
DS1744 3.3/5STDY2K32K
Parallel/BytewideM,P
DS1746 3.3/5STDY2K128K

Parallel/BytewideM,P
DS1747 3.3/5STDY2K512K

Parallel/BytewideM,P
Multiplexed Bus Real Time Clocks
Part Number Power
Options
(Volts)		 Clock
Format		 Calendar
Format		 User RAM
(Bytes)		 Features NV SRAM
Control		 Optional
Industrial
Grade		 Serial
Number		 Bus Type Chip/
Module
DS12885 5STDSTD114A,P,U

Parallel/MuxedC
DS12887 5STDSTD114A,P,U


Parallel/MuxedM
DS12887A 5STDSTD114A,P,U,RC


Parallel/MuxedM
DS12C887 5STDY2K113A,P,U


Parallel/MuxedM
DS12C887A 5STDY2K113A,P,U,RC


Parallel/MuxedM
DS14285 5STDSTD114A,P,U
Parallel/MuxedC
DS14287 5STDSTD114A,P,U

Parallel/MuxedM
DS1685 3/5STDY2K114+128A,P,U,KS,WU,RC
Parallel/MuxedC
DS1687 3/5STDY2K114+128A,P,U,KS,WU,RC
Parallel/MuxedM
DS1688 3/5STDY2K114A,P,U,KS,WU,RC,VC,PC Parallel/MuxedC
DS1689 3/5STDY2K114A,P,U,KS,WU,RC,VC,PC Parallel/MuxedC
DS1691 3/5STDY2K114A,P,U,KS,WU,RC,VC,PC
Parallel/MuxedM
DS1693 3/5STDY2K114A,P,U,KS,WU,RC,VC,PC
Parallel/MuxedM
DS17285 3/5STDY2K114+2KA,P,U,KS,WU,RC
Parallel/MuxedC
DS17287 3/5STDY2K114+2KA,P,U,KS,WU,RC

Parallel/MuxedM
DS17485 3/5STDY2K114+4KA,P,U,KS,WU,RC

Parallel/MuxedC
DS17487 3/5STDY2K114+4KA,P,U,KS,WU,RC

Parallel/MuxedM
DS17885 3/5STDY2K114+8KA,P,U,KS,WU,RC

Parallel/MuxedC
DS17887 3/5STDY2K114+8KA,P,U,KS,WU,RC

Parallel/MuxedM
Serial Clocks
Part Number Power
Options
(Volts)		 Clock
Format		 Calendar
Format		 User RAM
(Bytes)		 Features NV SRAM
Control		 Optional
Industrial
Grade		 Bus Type
DS1302 2-5STDSTD31TC
3-Wire
DS1305 2-5STDSTD96Ax2,TC
3-Wire or SPI
DS1306 2-5STDSTD96Ax2,TC
3-Wire or SPI
DS1307 5STDSTD56

 2-Wire
DS1602 5BINARYBINARY



3-Wire
DS1603 5BINARYBINARY



3-Wire
DS1670* 3.3STDSTD
A,ADx3,WD,UR
3-Wire
DS1672 2/3/3.3BINARYBINARY
UR,TC

2-Wire
DS1673* 3/5STDSTD
A,ADx3,WD,UR
3-Wire
DS1677* 5STDSTD
A,ADx3,WD,UR
3-Wire
* 3-channel A/D, CPU Reset
Phantom Clocks
Part Number Power
Options
(Volts)		 Clock
Format		 Calendar
Format		 User RAM
(Bytes)		 NV SRAM
Control		 Optional
Industrial
Grade		 Bus Type Chip/Module
Socket/
PowerCap*
DS1216B 5STD+hhSTDRAM: 2K,8K

Parallel/PhantomS
DS1216C 5STD+hhSTDRAM: 8K,32K

Parallel/PhantomS
DS1216D 3.3/5STD+hhSTDRAM: 8K,32K,128K

Parallel/PhantomS
DS1216E 3/5STD+hhSTDROM: 8K,32K

Parallel/PhantomS
DS1216F 3/5STD+hhSTDROM: 8K,32K,128K

Parallel/PhantomS
DS1216H 3.3/5STD+hhSTDRAM: 128K,512K

Parallel/PhantomS
DS1243Y 5STD+hhSTD8K

Parallel/PhantomM
DS1244Y 3.3/5STD+hhSTD32K
Parallel/PhantomM,P
DS1248Y 3.3/5STD+hhSTD128K
Parallel/PhantomM,P
DS1251Y 3.3/5STD+hhSTD512K
Parallel/PhantomM,P
DS1315 3.3/5STD+hhSTD
 Parallel/PhantomC
DS1216s will accept ROM or static RAM of sizes indicated.

A - Time of Day Alarm Programmable interrupt activated when time of day matches the programmed alarm registers
CR - Century Register The Century Register is automatically updated at the turn of the century.
ER - Event Recorder Records the time between events.
KS - Kickstart External signal to the RTC causes an interrupt output that turns on the system power supply
P - Periodic Programmable periodic interrupt that occurs from 500 ms to 122 µs
PC - Power Cycle Counter Counts the number of times power is cycled.
RC - RAM Clear Interrupt generated when the RTC has completed a RAM clear operation
U - Update in Progress Allows the user to determine if the RTC is ready to perform an update cycle
UR - Microprocessor Reset Holds the micro processor in reset until power to the RTC is stabilized.
VC - Vcc Active Counter Binary counter that counts only when Vcc is active.
WD - Watchdog Watchdog timer
WU - Wake-up Internal alarm designed to wake up the system at a specified time/date
Note:
Standard Clock Format is HH:MM:SS and STD+hh is HH:MM:SS:hh
Calendar Format for Y2K devices (Y2K) is YYYY-MM-DD.
Standard Calendar Format (STD) for other Timekeeping devices is YY-MM-DD.
Вверх

Cross Reference

Part Number Dallas Cross Reference Comment Part Number Dallas Cross Reference Comment
STMicroelecrtonics (SGS-Thomson)
M48Tx2, MK48Tx2DS1642Direct Cross M48Tx2, MK48Tx2DS1742Y2K Compliant Cross
M48Tx8, MK48Tx8DS1643Direct Cross M48Tx8, MK48Tx8DS1743Y2K Compliant Cross
M48T35DS1644Direct Cross M48T35DS1744Y2K Compliant Cross
M48T59DS1386-8Features Similar M48T59DS1543Direct Cross
M48T59DS1553Y2K Compliant Cross M48T86DS12887Direct Cross
M48T86DS12C887Y2K Compliant Cross MK41T56DS1307Direct Cross
Philips
PCF8583DS1307Features Similar PCF8593DS1307Features Similar
Epson
65271DS1397Direct Cross 6593DS1285Near Direct Cross
8583DS1307Features Similar 8592DS1307Features Similar
Motorola
MC146818A/BDS12885Near Direct Cross MC68HC68T1DS1305, DS1306Features Similar
BenchMarq
BQ3285DS12885Direct Cross BQ3285EDS1685-5Features Similar; Y2K
BQ3285LDS1685-3Features Similar; Y2K BQ3287DS12887Direct Cross
BQ3287DS12C887Y2K Cross BQ3287ADS12887ADriect Cross
BQ3287ADS12C887AY2K Cross BQ3287EDS1687-5Features Similar; Y2K
BQ4285DS14285Direct Cross BQ4287DS14287Direct Cross
BQ4830YDS1644Direct Cross BQ4830YDS1744Y2K Cross
BQ4832YDS1386-32Features Similar BQ4832YDS1554Features Similar; Y2K
BQ4842DS1486Features Similar BQ4842DS1556Features Similar; Y2K
BQ4850YDS1647Direct Cross BQ4850YDS1747Y2K Cross
BQ4845DS1284Features Similar BQ4845DS1501Features Similar
BQ4847DS1286Features Similar BQ4847DS1511Features Similar

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