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| Part Number | DS1556WP-120IND+ | DS1557WP-120IND+ | DS1554WP-120IND+ | DS1556W-120IND+ | DS1556WP-120IND |
|---|---|---|---|---|---|
| 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 | Active | 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 | 512KB | 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 | 2.97V ~ 3.63V | 2.97V ~ 3.63V | 2.97V ~ 3.63V | 2.97V ~ 3.63V | 2.97V ~ 3.63V |
| Voltage - Supply, Battery | 3V | 3V | 3V | - | 3V |
| Current - Timekeeping (Max) | 4mA @ 3.3V | 4mA @ 3.3V | 4mA @ 3.3V | 4mA @ 3.3V | 4mA @ 3.3V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°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 |
