DS1216C

SmartWatch RAM DS1216B/C/D/H
SmartWatch ROM DS1216E/F

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Overview

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

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 V_CC 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.