DS1644LPM Datasheet | Dallas Semiconducotr

DS1644LPM Nonvolatile Timekeeping RAM Features - Upward patible 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 pensation valid up...