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| Part Number | DS1556P-70+ | DS1553P-70+ | DS1554P-70+ | DS1556-70+ | DS1556P-70 | 
|---|---|---|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated | 
| Product Status | Active | Obsolete | Active | Active | Obsolete | 
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | 
| Features | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | Alarm, Leap Year, NVSRAM, Watchdog Timer, Y2K | 
| Memory Size | 128KB | 8KB | 32KB | 128KB | 128KB | 
| Time Format | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | 
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | 
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | 
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 
| Voltage - Supply, Battery | 3V | 3V | 3V | - | 3V | 
| Current - Timekeeping (Max) | 6mA @ 5V | 3mA @ 5V | 6mA @ 5V | 6mA @ 5V | 6mA @ 5V | 
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Through Hole | Surface Mount | 
| Package / Case | 34-PowerCap™ Module | 34-PowerCap™ Module | 34-PowerCap™ Module | 32-DIP Module (0.600", 15.24mm) | 34-PowerCap™ Module | 
| Supplier Device Package | 34-PowerCap Module | 34-PowerCap Module | 34-PowerCap Module | 32-EDIP | 34-PowerCap Module |