Maxim Integrated DS1643
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.| Part No. | DS1643 |
|---|---|
| Datasheet | DS1643 Download |
| Manufacturer |  Maxim Integrated |
| Description | Nonvolatile Timekeeping RAMs |
| Buy | Stock & Price |
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% 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 (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 PIN CONFIGURATIONS TOP VIEW N.C.
