DS1689

DS1689 Description 
The Analog Devices DS1689 is an automatic backup real-time clock with a unique 64-bit serial number and an additional 64-bit user-specific ROM or serial number.
The DS1689 includes a power-on time counter, a power-on cycle counter, and a battery-powered continuous counter. It is available in a PDIP-28 package. DS1689
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 DS1689 Applications ·Consumer Electronics·Industrial Applications