DS1643
FEATURES
- Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source
- Clock Registers are Accessed Identically to the Static RAM. These Registers Reside in the Eight Top RAM Locations.
- Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
- Access Times of 85ns and 100ns
- BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year pensation Valid Up to 2100
- Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolerance
- Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time
- DS1643 Only (DIP Module) Standard JEDEC Byte-Wide 8K x 8 RAM Pinout
- UL Recognized
- DS1643P Only (Power Cap Module Board) Surface Mountable Package for Direct Connection to Power Cap Containing Battery and Crystal Replaceable Battery (Power Cap) Power-Fail Output Pin-for-Pin patible with Other Densities of DS164XP Timekeeping RAM
PIN CONFIGURATIONS
TOP VIEW N.C....
