DS1251Y-70+

The DS1251 4096K NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 512K words by 8 bits) with a built-in real-time clock. The DS1251Y has a self-contained lithium energy source and control circuitry which constantly monitors V_CC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent garbled data in both the memory and real-time clock.

Key Features

• Real-Time Clock Keeps Track of Hundredths Of Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years
• 512k x 8 NV SRAM Directly Replaces Volatile Static RAM or EEPROM
• Embedded Lithium Energy Cell Maintains Calendar Operation and Retains RAM data
• Watch function is Transparent to RAM Operation
• Automatic Leap Year Compensation Valid Up to 2100
• Over 10 Years of Data Retention in the Absence of Power
• Full 10% Operating Range
• Lithium Energy Source is Electrically Disconnected to Retain Freshness until Power is Applied for the First Time
• DIP Module Only
  • Standard 32-Pin JEDEC Pinout
  • Upward Compatible with the DS1248
• PowerCap Module Board Only
  • Surface Mountable Package for Direct Connection to PowerCap Containing Battery and Crystal
  • Replaceable Battery (PowerCap)
  • Pin-for-Pin Compatible with Other Densities of DS124xP Phantom Clocks