DS9034PCX_ データシートの表示（PDF） - Maxim Integrated

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DS9034PCX_

64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM

Maxim Integrated 

Figure 2. Clearing IRQ Waveforms

CE ,

DS1553 64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM

Figure 3. Clearing IRQ Waveforms

CE = Ø

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

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