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DS1644 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS1644 Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 14 page  DS1644/DS1644P 6 of 14 DATA RETENTION MODE When VCC is within nominal limits (VCC > 4.5 volts) the DS1644 can be accessed as described above with read or write cycles. However, when VCC is below the power-fail point VPF (point at which write protection occurs) the internal clock registers and RAM are blocked from access. This is accomplished internally by inhibiting access via the CE signal. At this time the power-fail output signal ( PFO ) will be driven active low and will remain active until VCC returns to nominal levels. When VCC falls below the level of the internal battery supply, power input is switched from the VCC pin to the internal battery and clock activity, RAM, and clock data are maintained from the battery until VCC is returned to nominal level. |
Similar Part No. - DS1644 |
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Similar Description - DS1644 |
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