DP8572AV ,Real Time Clock (RTC)DP8572A/DP8572AMRealTimeClock(RTC)May1993DP8572A/DP8572AMRealTimeClock(RTC)GeneralDescriptionThe DP ..
DP8572AV ,Real Time Clock (RTC)DP8572A/DP8572AMRealTimeClock(RTC)May1993DP8572A/DP8572AMRealTimeClock(RTC)GeneralDescriptionThe DP ..
DP8573AN ,Real Time Clock (RTC)DP8573ARealTimeClock(RTC)May1993DP8573ARealTimeClock(RTC)GeneralDescriptionlThe DP8573A is intended ..
DP8573AV ,Real Time Clock (RTC)FeaturestheClockCounters,theAlarmCompareRAM,andtheTimeYFull function real time clock/calendarSave R ..
DP8573AV ,Real Time Clock (RTC)FeaturestheClockCounters,theAlarmCompareRAM,andtheTimeYFull function real time clock/calendarSave R ..
DPA4111 ,DPA Series Microelectronic Power IC Relay
DS90CR217MTD ,+3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link TransmitterFeaturesn 20 to 85 MHz shift clock supportThe DS90CR217 transmitter converts 21 bits of CMOS/TTLdat ..
DS90CR217MTDX ,+3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link TransmitterFeaturesn 20 to 85 MHz shift clock supportThe DS90CR217 transmitter converts 21 bits of CMOS/TTLdat ..
DS90CR218AMTD ,+3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link ReceiverFeaturesn 20 to 85 MHz shift clock supportThe DS90CR217 transmitter converts 21 bits of CMOS/TTLdat ..
DS90CR218AMTDX ,+3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link ReceiverDS90CR217/DS90CR218A +3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link-85 MHzMay 2002DS90CR217 ..
DS90CR218AMTDX/NOPB ,+3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link ReceiverElectrical CharacteristicsOver recommended operating supply and temperature ranges unless otherwise ..
DS90CR218MTD ,+3.3V Rising Edge Data Strobe LVDS 21-Bit Channel Link ReceiverFeaturesn 20 to 75 MHz shift clock supportThe DS90CR217 (see DS90CR217/218A datasheet) trans-mitter ..
DP8572AN-DP8572AV
Real Time Clock (RTC)
TL/F/9980
DP8572A/DP8572AM
Real
Time
Clock
(RTC)
May 1993
DP8572A/DP8572AM Real Time Clock (RTC)
General Description
The DP8572A (8572AMÐmilitarized version)is intendedfor
usein microprocessor based systems where informationis
requiredfor multi-tasking, data loggingor general timeof
day/date information. This deviceis implementedinlow
voltage silicon gate microCMOS technologyto providelow
standby powerin battery back-up environments. Thecir-
cuit’s architectureis such thatit looks likea contiguous
blockof memoryorI/O ports.The address spaceis orga-
nizedas2 software selectable pagesof32 bytes. Thisin-
cludesthe Control Registers,the Clock Counters,the Alarm
Compare RAM,andthe Time Save RAM.Anyofthe RAM
locationsthatarenot being usedfor their intended purpose
maybe usedas general purpose CMOS RAM.
Timeand dateare maintained from 1/100ofa secondto
yearand leap yearina BCD format,12or24 hour modes.
Dayof week, dayof month anddayof year countersare
provided. Timeis controlledbyan on-chip crystal oscillator
requiring onlythe additionofthe crystalandtwo capacitors.
The choiceof crystal frequencyis program selectable.
Power failurelogicand controlfunctionshavebeen integrat-on chip. This logicis usedbythe RTCto issuea power
fail interrupt,and lockoutthemp interface. The time power
fails maybe loggedinto RAM automatically when VBBl
VCC. Additionally, two supply pins are provided. When
VBBl VCC, internal circuitrywill automatically switch from
the main supplytothe battery supply. Statusbitsare provid-to indicate initial applicationof battery power, system
power, andlow battery detect. (Continued)
Features Full functionreal time clock/calendar 12/24 hour mode timekeepingDayof weekanddayof years counters Four selectable oscillator frequencies Parallel resonant oscillator Powerfail features Internal power supply switchto external battery Power SupplyBus glitch protection Automaticlogof timeinto RAMat power failure On-chip interrupt structure Periodic, alarm,and powerfail interruptsUpto44 bytesof CMOS RAM MIL-STD-883C compliant SMD Ý5962-91641-01MJX (future)
Block Diagram
TL/F/9980–1
FIGURE1
TRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
