DS1644LPM DS1644LPM Nonvolatile Timekeeping RAM FEATURES • Upward compatible with the DS1643AL Timekeeping RAM to achieve higher RAM density • Integrated NV SRAM, real time clock, crystal, power– fail control circuit and lithium energy source • Low profile socketable module – 255 mil package height • Clock registers are accessed identical to the static RAM.
These registers are resident in the eight top RAM locations.
• Totally nonvolatile with over 10 years of operation in the absence of power • Access time of 120 ns and 150 ns • Quartz accuracy ±1 minute a month @ 25°C, factory calibrated • BCD coded year, month, date, day, hours, minutes, and seconds with leap year compensation valid up t...

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