DS1556-70IND Maxim Integrated Products, DS1556-70IND Datasheet - Page 9

• Manufacturer Part Number: DS1556-70IND
• Description: Real Time Clock
• Manufacturer: Maxim Integrated Products

Specifications of DS1556-70IND

• Function: Clock, Calendar, NV Timekeeping RAM, Watchdog Timekeeper
• Rtc Memory Size: 131072 B
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: Through Hole
• Rtc Bus Interface: Parallel
• Package / Case: eDIP
• Time Format: HH:MM:SS
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM
Figure 3. Clearing IRQ Waveforms
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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