DS1556-70IND+ Maxim Integrated Products, DS1556-70IND+ Datasheet - Page 9
DS1556-70IND+
Manufacturer Part Number
DS1556-70IND+
Description
IC RTC RAM Y2K 5V 70NS 32-EDIP
Manufacturer
Maxim Integrated Products
Type
Clock/Calendar/NVSRAM/Y2Kr
Datasheet
1.DS1556P-70.pdf
(18 pages)
Specifications of DS1556-70IND+
Memory Size
1M (128K 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
-40°C ~ 85°C
Mounting Type
Through Hole
Package / Case
32-DIP Module (600 mil), 32-EDIP
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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