DS1643-70 Datasheet PDF - Maxim Integrated

●DESCRIPTION

●The DS1643 is an 8K x 8 nonvolatile static RAM with a full function Real Time Clock (RTC) that are both accessible in a byte-wide format. The nonvolatile timekeeping RAM is functionally equivalent to any JEDEC standard 8K x 8 SRAM. The device can also be easily substituted in ROM, EPROM and EEPROM sockets providing read/write nonvolatility and the addition of the real time clock function. The real time clock information resides in the eightuppermost RAM locations.

●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 Compensation Valid Up to 2100

●Power-Fail Write Protection Allows for ±10% VCCPower 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 (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