ds1553p-85 Maxim Integrated Products, Inc., ds1553p-85 Datasheet - Page 9

• Manufacturer Part Number: ds1553p-85
• Description: 64kb, Nonvolatile, Year-2000-compliant Timekeeping Ram
• Manufacturer: Maxim Integrated Products, Inc.

Figure 2. Clearing IRQ Waveforms
Figure 3. Clearing IRQ Waveforms
The
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
IRQ
CE
CE = Ø
,
/FT pin can also be activated in the battery-backed mode. The
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IRQ
/FT goes low if an alarm