DS1689SN+

DETAILED
The DS1689/DS1693 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 DS1689 also incorporates a number of enhanced features including a silicon serial number, power-on/off control circuitry, and 114 bytes of user NV SRAM, power-on elapsed timer, and power-cycle counter.
FEATURESIncorporates 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 (DS1689) or Stand-Alone Module with Embedded Battery and Crystal (DS1693)
• Available in Industrial Temperature Version
• Timekeeping Algorithm Includes Leap Year Compensation Valid Up to 2100