DS1643P Description
This open-drain pin requires a pullup resistor for proper operation. Ground Crystal Connection, Battery Connection 2 of 17 DS1643/DS1643P .. 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 byt.
DS1643P Key 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 (PowerCap Module Board) Surface Mountable Package for Direct Connection to PowerCap Containing Battery and