ds1553p-85 Maxim Integrated Products, Inc., ds1553p-85 Datasheet - Page 9
ds1553p-85
Manufacturer Part Number
ds1553p-85
Description
64kb, Nonvolatile, Year-2000-compliant Timekeeping Ram
Manufacturer
Maxim Integrated Products, Inc.
Datasheet
1.DS1553P-85.pdf
(23 pages)
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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
9 of 23
IRQ
/FT goes low if an alarm
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