DS12CR887+5 ,RTC with Constant-Voltage Trickle ChargerFeaturesThe DS12R885 is a functional drop-in replacement for♦ Trickle-Charge Capability for a Recha ..
DS12CR887-33+ ,RTCs with Constant-Voltage Trickle ChargerFeaturesThe DS12R885 is a functional drop-in replacement for♦ Trickle-Charge Capability for a Recha ..
DS12CR887-5+ ,RTCs with Constant-Voltage Trickle ChargerELECTRICAL CHARACTERISTICS(V = V to V , T = -40°C to +85°C, (DS12R887-33 and DS12R887-5, T = -20°C ..
DS12R885-33 ,RTC with Constant-Voltage Trickle ChargerELECTRICAL CHARACTERISTICS(V = V to V , T = -40°C to +85°C, unless otherwise noted.) (Note 1)CC CC( ..
DS12R885-5 ,RTC with Constant-Voltage Trickle ChargerELECTRICAL CHARACTERISTICS (DS12R885 Only)(V = 0V, V = 3.2V, T = -40°C to +85°C, unless otherwise n ..
DS12R887-33 ,RTC with Constant-Voltage Trickle ChargerFeaturesThe DS12R885 is a functional drop-in replacement for♦ Trickle-Charge Capability for a Recha ..
DTC114YET1 ,Bias Resistor Transistor3DTC114YEMINIMUM RECOMMENDED FOOTPRINTS FOR SURFACE MOUNTED APPLICATIONSSurface mount board layout ..
DTC114YET1G ,Bias Resistor TransistorTHERMAL CHARACTERISTICSSee detailed ordering, marking, and shipping information inthe package dimen ..
DTC114YETL , NPN 100mA 50V Digital Transistors (Bias Resistor Built-in Transistors)
DTC114YKA T146 , NPN 100mA 50V Digital Transistors
DTC114YKAT146 , NPN 100mA 50V Digital Transistors
DTC114YKA-T146 , NPN 100mA 50V Digital Transistors
DS12CR887+33-DS12CR887+5-DS12R885-33-DS12R885-5-DS12R887-33-DS12R887-5
RTC with Constant-Voltage Trickle Charger
General DescriptionThe DS12R885 is a functional drop-in replacement for
the DS12885 real-time clock (RTC). The device pro-
vides an RTC/calendar, one time-of-day alarm, three
maskable interrupts with a common interrupt output, a
programmable square wave, and 114 bytes of battery-
backed static RAM. The date at the end of the month is
automatically adjusted for months with fewer than 31
days, including correction for leap years. It also oper-
ates in either 24-hour or 12-hour format with an AM/PM
indicator. A precision temperature-compensated circuit
monitors the status of VCC. If a primary power failure is
detected, the device automatically switches to a back-
up supply. The VBACKUPpin supports a rechargeable
battery or a super cap and includes an integrated,
always enabled trickle charger. The DS12R885 is
accessed through a multiplexed byte-wide interface,
which supports both Intel and Motorola modes. The
DS12CR887 and DS12R887 integrate the DS12R885
die with a crystal and battery.
ApplicationsEmbedded Systems
Utility Meters
Security Systems
Network Hubs, Bridges, and Routers
FeaturesTrickle-Charge Capability for a Rechargeable
Battery or Super CapSelectable Intel or Motorola Bus TimingRTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year with Leap-Year Compensation to
2100Interrupt Output with Three Independently
Maskable Interrupt FlagsTime-of-Day Alarm is Once-per-Second to Once-
per-DayPeriodic Rates from 122µs to 500msEnd-of-Clock Update Cycle Flag14 Bytes of Clock and Control Registers114 Bytes of General-Purpose RAM with Clear InputProgrammable Square-Wave OutputAutomatic Power-Fail Detect and Switch Circuitry+5.0V or +3.3V OperationIndustrial Temperature RangeDS12CR887 Encapsulated DIP (EDIP) Module with
Integrated Battery and CrystalDS12R887 BGA Module Surface-Mountable
Package with Integrated Crystal and Rechargeable
Battery
DS12R885/DS12CR887/DS12R887
RTC with Constant-Voltage Trickle Charger
Ordering Information
Typical Operating CircuitRev 1; 4/04
Pin Configurations appear at end of data sheet.*Future product—contact factory for availability.
DS12R885/DS12CR887/DS12R887
RTC with Constant-Voltage Trickle Charger
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on VCCPin Relative to Ground.....-0.3V to +6.0V
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-55°C to +125°C
Soldering Temperature.......................................See IPC/JEDEC
J-STD-020A Specification
Soldering Temperature (leads, 10s)................................+260°C
DS12R885/DS12CR887/DS12R887
RTC with Constant-Voltage Trickle Charger
AC ELECTRICAL CHARACTERISTICS(VCC
DS12R885/DS12CR887/DS12R887
RTC with Constant-Voltage Trickle Charger
AC ELECTRICAL CHARACTERISTICS
(VCC
DS12R885/DS12CR887/DS12R887
RTC with Constant-Voltage Trickle Charger
Motorola Bus Read/Write Timing
Intel Bus Write Timing
