Real Time Clock Phantom Clock/Parallel 32KByte 32-Pin PDIP W

GENERAL DESCRIPTION The DS1216 SmartWatch RAM and SmartWatch ROM sockets are 600-mil-wide DIP sockets with a built-in CMOS watch function, an NV RAM controller circuit, and an embedded lithium energy source. The sockets provide an NV RAM solution for memory sized from 2K x 8 to 512K x 8 with package sizes from 26 pins to 32 pins. When a socket is mated with a CMOS SRAM, it provides a complete solution to problems associated with memory volatility and uses a common energy source to maintain time and date. The SmartWatch ROM sockets use the embedded lithium source to maintain the time and date only. A key feature of the SmartWatch is that the watch function remains transparent to the RAM. The SmartWatch monitors VCC for an out-of-tolerance condition. When such a condition occurs, an internal lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent loss of watch and RAM data.

• Keeps Track of Hundredths of Seconds, Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years
• Converts Standard 2K x 8 Up to 512K x 8 CMOS Static RAMs into Nonvolatile Memory
• Embedded Lithium Energy Cell Maintains Watch Information and Retains RAM Data
• Watch Function is Transparent to RAM Operation
• Automatic Leap Year Compensation Valid Up to 2100
• Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time
• Proven Gas-Tight Socket Contacts
• Full ±10% Operating Range
• Accuracy Better Than ±1 Minute/Month at +25°C