DS1553-70 Maxim Integrated Products, DS1553-70 Datasheet - Page 9

• Manufacturer Part Number: DS1553-70
• Description: IC RTC RAM Y2K 5V 70NS 28-EDIP
• Manufacturer: Maxim Integrated Products
• Type: Clock/Calendar/NVSRAM/Y2Kr

Specifications of DS1553-70

• Memory Size: 64K (8K x 8)
• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP Module (600 mil), 28-EDIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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