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DS1643P Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS1643P Datasheet(HTML) 5 Page - Dallas Semiconductor |
5 / 14 page DS1643/DS1643P 5 of 14 level. The RST signal is an open drain output and requires a pull up. Except for the RST , all control, data, and address signals must be powered down when VCC is powered down. BATTERY LONGEVITY The DS1643 has a lithium power source that is designed to provide energy for clock activity, and clock and RAM data retention when the VCC supply is not present. The capability of this internal power supply is sufficient to power the DS1643 continuously for the life of the equipment in which it is installed. For specification purposes, the life expectancy is 10 years at 25 °C with the internal clock oscillator running in the absence of VCC power. Each DS1643 is shipped from Dallas Semiconductor with its lithium energy source disconnected, guaranteeing full energy capacity. When VCC is first applied at a level greater than VPF, the lithium energy source is enabled for battery backup operation. Actual life expectancy of the Ds1643 will be much longer than 10 years since no lithium battery energy is consumed when VCC is present. |
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