DS1556WP-120IND View Datasheet(PDF) - Maxim Integrated

Part Name

Description

Manufacturer

DS1556WP-120IND

1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

Maxim Integrated 

Figure 3. Clearing IRQ Waveforms

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM

CE=0

The IRQ/FT pin can also be activated in the battery-backed mode. The IRQ/FT will go 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 will set 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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