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DS1643 series datasheets. Manufacturer: Dallas Semiconductor.

DS1643-120Nonvolatile timekeeping RAM, 120ns access in 28-pin DIP package. Operational temperature range from 0°C to 70°C.Datasheet*)
DS1643-150Nonvolatile timekeeping RAM, 150ns access in 28-pin DIP package. Operational temperature range from 0°C to 70°C.Datasheet*)
DS1643Nonvolatile Timekeeping RAMDatasheet*)
DS1643-100Nonvolatile Timekeeping RAMDatasheet*)
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