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DS1553W-120+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS1553W-120+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 20 page DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM 9 of 20 Figure 2. Clearing IRQ Waveforms Figure 3. Clearing IRQ Waveforms The IRQ /FT pin can also be activated in the battery-backed mode. The IRQ /FT goes low if an alarm occurs and both ABE and AE are set. The ABE and AE bits are cleared during the power-up transition, however, an alarm generated during power-up sets AF. Therefore, the AF bit can be read after system power-up to determine if an alarm was generated during the power-up sequence. Figure 4 illustrates alarm timing during the battery-backup mode and power-up states. Figure 4. Backup Mode Alarm Waveforms CE = Ø CE , |
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