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Микросхемы и модули часов/календарей реального времени |
Фирма Dallas Semiconductor является мировым лидером в производстве микросхем и модулей часов/календарей реального времени и производит большую номенклатуру данных изделий, включая модули со встроенными кварцевыми резонаторами и литиевыми элементами питания, гарантирующими сохранение данных в течении 10 лет непрерывной работы.
| 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. |
| 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 | 5 | STD | Y2K | 113 | A,CR | Parallel/Muxed | M | |||
| DS1500 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR |  |
Parallel/Bytewide | C | ||
| DS1501 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | |
Parallel/Bytewide | C | ||
| DS1510 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | |
Parallel/Bytewide | M | ||
| DS1511 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | |
Parallel/Bytewide | M | ||
| DS1553 | 3.3/5 | STD | Y2K | 8K | A,WD,UR | Parallel/Bytewide | M,P | |||
| DS1554 | 3.3/5 | STD | Y2K | 32K | A,WD,UR | Parallel/Bytewide | M,P | |||
| DS1556 | 3.3/5 | STD | Y2K | 128K | A,WD,UR | Parallel/Bytewide | M,P | |||
| DS1557 | 3.3/5 | STD | Y2K | 512K | A,WD,UR | Parallel/Bytewide | P | |||
| DS1678 | 5 | STD | Y2K | 32 | A,ER | 2-Wire | C | |||
| DS1685 | 3/5 | STD | Y2K | 114+128 | A,P,U,KS,WU,RC | |
| Parallel/Muxed | C | |
| DS1687 | 3/5 | STD | Y2K | 114+128 | A,P,U,KS,WU,RC | |
| Parallel/Muxed | M | |
| DS1688 | 3/5 | STD | Y2K | 114 | A,P,U,KS,RC,VC,PC | |
| Parallel/Muxed | C | |
| DS1689 | 3/5 | STD | Y2K | 114 | A,P,U,KS,RC,VC,PC | | |
| Parallel/Muxed | C |
| DS1691 | 3/5 | STD | Y2K | 114 | A,P,U,KS,RC,VC,PC | |
| Parallel/Muxed | M | |
| DS1693 | 3/5 | STD | Y2K | 114 | A,P,U,KS,RC,VC,PC | |
| Parallel/Muxed | M | |
| DS17285 | 3/5 | STD | Y2K | 114+2K | A,P,U,KS,WU,RC | |
| Parallel/Muxed | C | |
| DS17287 | 3/5 | STD | Y2K | 114+2K | A,P,U,KS,WU,RC | |
Parallel/Muxed | M | ||
| DS17485 | 3/5 | STD | Y2K | 114+4K | A,P,U,KS,WU,RC | |
| Parallel/Muxed | C | |
| DS17487 | 3/5 | STD | Y2K | 114+4K | A,P,U,KS,WU,RC | |
Parallel/Muxed | M | ||
| DS17885 | 3/5 | STD | Y2K | 114+8K | A,P,U,KS,WU,RC | |
| Parallel/Muxed | C | |
| DS17887 | 3/5 | STD | Y2K | 114+8K | A,P,U,KS,WU,RC | |
| Parallel/Muxed | M | |
| DS1742 | 3.3/5 | STD | Y2K | 2K | Parallel/Bytewide | M | ||||
| DS1743 | 3.3/5 | STD | Y2K | 8K | Parallel/Bytewide | M | ||||
| DS1744 | 3.3/5 | STD | Y2K | 32K | | Parallel/Bytewide | M,P | |||
| DS1746 | 3.3/5 | STD | Y2K | 128K | Parallel/Bytewide | M,P | ||||
| DS1747 | 3.3/5 | STD | Y2K | 512K | Parallel/Bytewide | M,P | ||||
| * Module includes embedded battery and 32.768 kHz crystal. | ||||||||||
| Year 2000-Compliant Clocks, Types of Features:
A - Time of Day AlarmProgrammable interrupt activated when time of day matches the programmed alarm registers UR - Microprocessor ResetHolds the micro processor in reset until power to the RTC is stabilized. KS - KickstartExternal signal to the RTC causes an interrupt output that turns on the system power supply P - PeriodicProgrammable periodic interrupt that occurs from 500 ms to 122 µs RC - RAM ClearInterrupt generated when the RTC has completed a RAM clear operation U - Update in ProgressAllows the user to determine if the RTC is ready to perform an update cycle WD - WatchdogWatchdog timer WU - Wake-upInternal alarm designed to wake up the system at a specified time/date ER - Event RecorderRecords the time between events. PC - Power Cycle CounterCounts the number of times power is cycled. VC - Vcc Active CounterBinary counter that counts only when Vcc is active. |
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| 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 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | | |
Parallel/Bytewide | C |
| DS1501 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | | Parallel/Bytewide | M | |
| DS1510 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | | Parallel/Bytewide | C | |
| DS1511 | 3.3/5 | STD | Y2K | 256 | A,KS,WU,WD,UR | Parallel/Bytewide | M | ||
| DS1543 | 3.3/5 | STD | STD | 8K | A,WD,UR | Parallel/Bytewide | M,P | ||
| DS1553 | 3.3/5 | STD | Y2K | 8K | A,WD,UR | Parallel/Bytewide | M,P | ||
| DS1554 | 3.3/5 | STD | Y2K | 32K | A,WD,UR | Parallel/Bytewide | M,P | ||
| DS1556 | 3.3/5 | STD | Y2K | 128K | A,WD,UR | Parallel/Bytewide | M,P | ||
| DS1557 | 3.3/5 | STD | Y2K | 512K | A,WD,UR | Parallel/Bytewide | M,P | ||
| DS1284 | 5 | STD+hh | STD | 50 | A,WD | | Parallel/Bytewide | C | |
| DS1286 | 5 | STD+hh | STD | 50 | A,WD | | Parallel/Bytewide | M | |
| DS1386 | 5 | STD+hh | STD | 8K,32K | A,WD | Parallel/Bytewide | M,P | ||
| DS1486 | 5 | STD+hh | STD | 128K | A,WD | Parallel/Bytewide | M,P | ||
| Watchdog Timekeepers, Types of Features:
A - Time of Day AlarmProgrammable interrupt is activated when time of day matches the programmed alarm registers. KS - KickstartAn external signal to the real time clock causes an interrupt output which turns on the system power supply. UR - Microprocessor ResetHolds the micro processor in reset until power to the RTC is stabilized. WU - Wake-upAn internal alarm designed to wake up the system at a specified time/date. WD - WatchdogInterrupt occurs after a programmed interval if the real time clock's watchdog registers are not accessed. |
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| 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 | 5 | STD | STD | 2K | Parallel/Bytewide | M | ||
| DS1643 | 5 | STD | STD | 8K | Parallel/Bytewide | M,P | ||
| DS1644 | 5 | STD | STD | 32K | Parallel/Bytewide | M,P | ||
| DS1646 | 5 | STD | STD | 128K | Parallel/Bytewide | M,P | ||
| DS1647 | 5 | STD | STD | 512K | Parallel/Bytewide | M,P | ||
| DS1742 | 3.3/5 | STD | Y2K | 2K | Parallel/Bytewide | M | ||
| DS1743 | 3.3/5 | STD | Y2K | 8K | Parallel/Bytewide | M,P | ||
| DS1744 | 3.3/5 | STD | Y2K | 32K | |
Parallel/Bytewide | M,P | |
| DS1746 | 3.3/5 | STD | Y2K | 128K | Parallel/Bytewide | M,P | ||
| DS1747 | 3.3/5 | STD | Y2K | 512K | Parallel/Bytewide | M,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 | 5 | STD | STD | 114 | A,P,U | | Parallel/Muxed | C | ||
| DS12887 | 5 | STD | STD | 114 | A,P,U | Parallel/Muxed | M | |||
| DS12887A | 5 | STD | STD | 114 | A,P,U,RC | Parallel/Muxed | M | |||
| DS12C887 | 5 | STD | Y2K | 113 | A,P,U | Parallel/Muxed | M | |||
| DS12C887A | 5 | STD | Y2K | 113 | A,P,U,RC | Parallel/Muxed | M | |||
| DS14285 | 5 | STD | STD | 114 | A,P,U | | |
Parallel/Muxed | C | |
| DS14287 | 5 | STD | STD | 114 | A,P,U | |
Parallel/Muxed | M | ||
| DS1685 | 3/5 | STD | Y2K | 114+128 | A,P,U,KS,WU,RC | |
| Parallel/Muxed | C | |
| DS1687 | 3/5 | STD | Y2K | 114+128 | A,P,U,KS,WU,RC | |
| Parallel/Muxed | M | |
| DS1688 | 3/5 | STD | Y2K | 114 | A,P,U,KS,WU,RC,VC,PC | | |
| Parallel/Muxed | C |
| DS1689 | 3/5 | STD | Y2K | 114 | A,P,U,KS,WU,RC,VC,PC | | |
| Parallel/Muxed | C |
| DS1691 | 3/5 | STD | Y2K | 114 | A,P,U,KS,WU,RC,VC,PC | |
| Parallel/Muxed | M | |
| DS1693 | 3/5 | STD | Y2K | 114 | A,P,U,KS,WU,RC,VC,PC | |
| Parallel/Muxed | M | |
| DS17285 | 3/5 | STD | Y2K | 114+2K | A,P,U,KS,WU,RC | |
| Parallel/Muxed | C | |
| DS17287 | 3/5 | STD | Y2K | 114+2K | A,P,U,KS,WU,RC | |
Parallel/Muxed | M | ||
| DS17485 | 3/5 | STD | Y2K | 114+4K | A,P,U,KS,WU,RC | |
Parallel/Muxed | C | ||
| DS17487 | 3/5 | STD | Y2K | 114+4K | A,P,U,KS,WU,RC | |
Parallel/Muxed | M | ||
| DS17885 | 3/5 | STD | Y2K | 114+8K | A,P,U,KS,WU,RC | |
Parallel/Muxed | C | ||
| DS17887 | 3/5 | STD | Y2K | 114+8K | A,P,U,KS,WU,RC | |
Parallel/Muxed | M | ||
| Multiplexed Bus Real Time Clocks, Types of Features:
A - Time of Day AlarmProgrammable interrupt activated when time of day matches the programmed alarm registers KS - KickstartExternal signal to the RTC causes an interrupt output that turns on the system power supply P - PeriodicProgrammable periodic interrupt that occurs from 500 ms to 122 µs RC - RAM ClearInterrupt generated when the RTC has completed a RAM clear operation U - Update in ProgressAllows the user to determine if the RTC is ready to perform an update cycle WU - Wake-upInternal alarm designed to wake up the system at a specified time/date PC - Power Cycle CounterCounts the number of times power is cycled. VC - Vcc Active CounterBinary counter that counts only when Vcc is active. |
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| Time and Temperature Recorders | ||||||||
| Part Number | Power Options (Volts) |
Clock Format |
Calendar Format |
User RAM (Bytes) |
Features | Optional Industrial Grade | Serial Number |
Bus Type |
| DS1615 | 5 | STD | STD | 32 | A,TA,TS | |
| 3-Wire |
| DS1616* | 5 | STD | Y2K | 32 | A,TA,CB | |
| 3-Wire |
| DS1678 | 5 | STD | Y2K | 32 | A,CR,ER | | 2-Wire | |
| DS1682 | 3-5 | BINARY | 10-EPROM | | 2-Wire | |||
| * 3-channel A/D | ||||||||
| Types of Features: A - Time of Day AlarmProgrammable interrupt is activated when the time of day matches the programmed alarm registers. CB - Century BitThe Century Bit is automatically updated at the end of the century. CR - Century RegisterThe Century Register is automatically updated at the turn of the century. ER - Event RecorderRecords the time between events. TA - Temperature AlarmHigh and low temperature alarms | ||||||||
| Serial Clocks | ||||||||
| Part Number | Power Options (Volts) |
Clock Format |
Calendar Format |
User RAM (Bytes) |
Features | NV SRAM Control |
Optional Industrial Grade |
Bus Type |
| DS1302 | 2-5 | STD | STD | 31 | TC | | 3-Wire | |
| DS1305 | 2-5 | STD | STD | 96 | Ax2,TC | | 3-Wire or SPI | |
| DS1306 | 2-5 | STD | STD | 96 | Ax2,TC | | 3-Wire or SPI | |
| DS1307 | 5 | STD | STD | 56 | | 2-Wire | ||
| DS1602 | 5 | BINARY | BINARY | 3-Wire | ||||
| DS1603 | 5 | BINARY | BINARY | 3-Wire | ||||
| DS1670* | 3.3 | STD | STD | A,ADx3,WD,UR | | 3-Wire | ||
| DS1672 | 2/3/3.3 | BINARY | BINARY | UR,TC | 2-Wire | |||
| DS1673* | 3/5 | STD | STD | A,ADx3,WD,UR | | 3-Wire | ||
| DS1677* | 5 | STD | STD | A,ADx3,WD,UR | | 3-Wire | ||
| * 3-channel A/D, CPU Reset | ||||||||
| Serial Clocks, Types of Features:
A - Time of Day AlarmProgrammable interrupt activated when time of day matches the programmed alarm registers WD - WatchdogWatchdog timer CR - Century RegisterThe Century Register is automatically updated at the turn of the century. ER - Event RecorderRecords the time between events. UR - Microprocessor ResetActivated when an out of tolerance Vcc condition is detected. | ||||||||
| 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 | 5 | STD+hh | STD | RAM: 2K,8K | Parallel/Phantom | S | ||
| DS1216C | 5 | STD+hh | STD | RAM: 8K,32K | Parallel/Phantom | S | ||
| DS1216D | 3.3/5 | STD+hh | STD | RAM: 8K,32K,128K | Parallel/Phantom | S | ||
| DS1216E | 3/5 | STD+hh | STD | ROM: 8K,32K | Parallel/Phantom | S | ||
| DS1216F | 3/5 | STD+hh | STD | ROM: 8K,32K,128K | Parallel/Phantom | S | ||
| DS1216H | 3.3/5 | STD+hh | STD | RAM: 128K,512K | Parallel/Phantom | S | ||
| DS1243Y | 5 | STD+hh | STD | 8K | Parallel/Phantom | M | ||
| DS1244Y | 3.3/5 | STD+hh | STD | 32K | | Parallel/Phantom | M,P | |
| DS1248Y | 3.3/5 | STD+hh | STD | 128K | | Parallel/Phantom | M,P | |
| DS1251Y | 3.3/5 | STD+hh | STD | 512K | | Parallel/Phantom | M,P | |
| DS1315 | 3.3/5 | STD+hh | STD | |
| Parallel/Phantom | C | |
| Note: DS1216s will accept ROM or static RAM of sizes indicated. | ||||||||
Часы/календари для работы в 2000 году
В настоящее время существующие схемы часов/календарей используют 2 цифры для кодирования года. При наступлении 2000 года регистр года обнулится и система будет воспринимать 2000 год как 1900. Кроме того, в дальнейшем будет неправильно происходить коррекция високосного года. Для перехода к 2000 году компания Dallas Semiconductor производит семейство часов/календарей, использующих, в отличие от предыдущих моделей, 4 цифры для кодирования года с правильной коррекцией високосного года. Все семейство часов для работы в 2000 году получило название "Y2K совместимые".
Структура области памяти Y2K совместимых часов на примере DS1743
| Адрес | Данные | Тип данных | |||||||
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | ||
| 1FFF | Год десятки | Год единицы | Год 00-99 | ||||||
| 1FFE | X | X | X | 10 M | Месяц единицы | Месяц 01-12 | |||
| 1FFD | X | X | Дата десятки | Дата единицы | Дата 01-31 | ||||
| 1FFC | BF | FT | X | X | X | День единицы | День 1-7 | ||
| 1FFB | X | X | Часы десятки | Часы единицы | Часы 00-23 | ||||
| 1FFA | X | Минуты десятки | Минуты единицы | Минуты 00-59 | |||||
| 1FF9 | OSC | Секунды десятки | Секунды единицы | Секунды 00-59 | |||||
| 1FF8 | W | R | Век десятки | Век единицы | Век 00-39 | ||||
Таблица замены часов/календарей других производителей изделиями Dallas Semiconductor
| Part Number | Dallas Cross Reference | Comment | Part Number | Dallas Cross Reference | Comment |
| STMicroelecrtonics (SGS-Thomson) | |||||
| M48Tx2, MK48Tx2 | DS1642 | Direct Cross | M48Tx2, MK48Tx2 | DS1742 | Y2K Compliant Cross |
| M48Tx8, MK48Tx8 | DS1643 | Direct Cross | M48Tx8, MK48Tx8 | DS1743 | Y2K Compliant Cross |
| M48T35 | DS1644 | Direct Cross | M48T35 | DS1744 | Y2K Compliant Cross |
| M48T59 | DS1386-8 | Features Similar | M48T59 | DS1543 | Direct Cross |
| M48T59 | DS1553 | Y2K Compliant Cross | M48T86 | DS12887 | Direct Cross |
| M48T86 | DS12C887 | Y2K Compliant Cross | MK41T56 | DS1307 | Direct Cross |
| Philips | |||||
| PCF8583 | DS1307 | Features Similar | PCF8593 | DS1307 | Features Similar |
| Epson | |||||
| 65271 | DS1397 | Direct Cross | 6593 | DS1285 | Near Direct Cross |
| 8583 | DS1307 | Features Similar | 8592 | DS1307 | Features Similar |
| Motorola | |||||
| MC146818A/B | DS12885 | Near Direct Cross | MC68HC68T1 | DS1305, DS1306 | Features Similar |
| BenchMarq | |||||
| BQ3285 | DS12885 | Direct Cross | BQ3285E | DS1685-5 | Features Similar; Y2K |
| BQ3285L | DS1685-3 | Features Similar; Y2K | BQ3287 | DS12887 | Direct Cross |
| BQ3287 | DS12C887 | Y2K Cross | BQ3287A | DS12887A | Driect Cross |
| BQ3287A | DS12C887A | Y2K Cross | BQ3287E | DS1687-5 | Features Similar; Y2K |
| BQ4285 | DS14285 | Direct Cross | BQ4287 | DS14287 | Direct Cross |
| BQ4830Y | DS1644 | Direct Cross | BQ4830Y | DS1744 | Y2K Cross |
| BQ4832Y | DS1386-32 | Features Similar | BQ4832Y | DS1554 | Features Similar; Y2K |
| BQ4842 | DS1486 | Features Similar | BQ4842 | DS1556 | Features Similar; Y2K |
| BQ4850Y | DS1647 | Direct Cross | BQ4850Y | DS1747 | Y2K Cross |
| BQ4845 | DS1284 | Features Similar | BQ4845 | DS1501 | Features Similar |
| BQ4847 | DS1286 | Features Similar | BQ4847 | DS1511 | Features Similar |
