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DS1644-120 series datasheets. Manufacturer: Dallas Semiconductor.

DS1644-12032K x 8 nonvolatile timekeeping static RAM, 120ns access in 34-pin LPM package. Operational temperature range from 0°C to 70°C.Datasheet*)
DS1644-15032K x 8 nonvolatile timekeeping static RAM, 150ns access in 34-pin LPM package. Operational temperature range from 0°C to 70°C.Datasheet*)
There are other manufacturers for this components. For more information please check
DS1644-120 (Maxim Integrated Products)
Click here to download DS1644-120 Datasheet
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*)

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