Maxim Integrated DS1688
- Part Number:
- DS1688
- Manufacturer:
- Maxim Integrated
- Ventron No:
- 3004878-DS1688
- Description:
- IC RTC CLK/CALENDAR PAR 28-DIP
- Datasheet:
- DS1688
Description
The DS1688/DS1691 are real-time clocks (RTCs) designed as successors to the industry-standard DS1285, DS1385, DS1485, and DS1585 PC real-time clocks. These devices provide the industry-standard DS1285 clock function with the new feature of either 3.0V or 5.0V operation and automatic backup and write protection to an external SRAM. The DS1688 also incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, 114 bytes of user NV SRAM, power-on elapsed timer, and power-cycle counter.
Features
Incorporates Industry Standard DS1287 PC Clock Plus Enhanced Features:
3V or 5V Operation
64-Bit Silicon Serial Number
64-Bit Customer Specific ROM or Additional Serial Number Available
Power Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
Automatic Battery Backup and Write Protection to External SRAM
Crystal Select Bit Allows RTC to Operate with 6Pf or 12.5Pf Crystal
114 Bytes User NV RAM
Auxiliary Battery Input
RAM Clear Input
Century Register
32kHz Output for Power Management
32-Bit Vcc Powered Elapsed Time Counter
32-Bit VBAT Powered Elapsed Time Counter
16-Bit Power-Cycle Counter
Compatible with Existing BIOS for Original DS1287 Functions
Available as IC (DS1688) or Stand-Alone Module with Embedded Battery and Crystal (DS1691)
Timekeeping Algorithm Includes Leap Year Compensation Valid Up to 2100
Applications
Timekeeping in PCs, Servers, and Embedded Systems
Power Management
System Monitoring
Security Systems
Industrial Control
Medical Devices
Consumer Electronics
The DS1688/DS1691 are real-time clocks (RTCs) designed as successors to the industry-standard DS1285, DS1385, DS1485, and DS1585 PC real-time clocks. These devices provide the industry-standard DS1285 clock function with the new feature of either 3.0V or 5.0V operation and automatic backup and write protection to an external SRAM. The DS1688 also incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, 114 bytes of user NV SRAM, power-on elapsed timer, and power-cycle counter.
Features
Incorporates Industry Standard DS1287 PC Clock Plus Enhanced Features:
3V or 5V Operation
64-Bit Silicon Serial Number
64-Bit Customer Specific ROM or Additional Serial Number Available
Power Control Circuitry Supports System Power-On from Date/Time Alarm or Key Closure
Automatic Battery Backup and Write Protection to External SRAM
Crystal Select Bit Allows RTC to Operate with 6Pf or 12.5Pf Crystal
114 Bytes User NV RAM
Auxiliary Battery Input
RAM Clear Input
Century Register
32kHz Output for Power Management
32-Bit Vcc Powered Elapsed Time Counter
32-Bit VBAT Powered Elapsed Time Counter
16-Bit Power-Cycle Counter
Compatible with Existing BIOS for Original DS1287 Functions
Available as IC (DS1688) or Stand-Alone Module with Embedded Battery and Crystal (DS1691)
Timekeeping Algorithm Includes Leap Year Compensation Valid Up to 2100
Applications
Timekeeping in PCs, Servers, and Embedded Systems
Power Management
System Monitoring
Security Systems
Industrial Control
Medical Devices
Consumer Electronics
Maxim Integrated DS1688 technical specifications, attributes, parameters and parts with similar specifications to Maxim Integrated DS1688.
- MountThrough Hole
- Mounting TypeThrough Hole
- Package / Case28-DIP (0.600, 15.24mm)
- Number of Pins28
- Operating Temperature0°C~70°C
- PackagingTube
- Published2005
- JESD-609 Codee0
- FeatureAlarm, Leap Year, Square Wave Output, Unique ID
- Pbfree Codeno
- Part StatusObsolete
- Moisture Sensitivity Level (MSL)1 (Unlimited)
- Number of Terminations28
- ECCN CodeEAR99
- Terminal FinishTin/Lead (Sn/Pb)
- Additional FeatureCAN ALSO OPERATE AT 5V
- HTS Code8473.30.11.80
- SubcategoryTimer or RTC
- TechnologyCMOS
- Voltage - Supply2.7V~3.3V 4.5V~5.5V
- Terminal PositionDUAL
- Peak Reflow Temperature (Cel)245
- Supply Voltage5V
- Terminal Pitch2.54mm
- Reach Compliance Codenot_compliant
- Reflow Temperature-Max (s)NOT SPECIFIED
- Base Part NumberDS1688
- Pin Count28
- Qualification StatusNot Qualified
- Power Supplies3/5V
- InterfaceParallel
- Memory Size114B
- Number of Bits16
- Logic FunctionClock
- External Data Bus Width8
- Number of Timers1
- Time FormatHH:MM:SS (12/24 hr)
- Date FormatYY-MM-DD
- Time-MinSECONDS
- Interrupt CapabilityY
- VolatileYES
- Height Seated (Max)5.08mm
- Length36.83mm
- Width15.24mm
- RoHS StatusNon-RoHS Compliant
- Lead FreeContains Lead
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