DS1643 Datasheet PDF

● 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 Compensation 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

● DS1643P Only (PowerCap Module Board)

● Surface Mountable Package for Direct Connection to PowerCap Containing Battery and Crystal

● Replaceable Battery (PowerCap)

● Power-Fail Output

● Pin-for-Pin Compatible with Other Densities of DS164XP Timekeeping RAM