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| PartNumber | DS1251WP-120+ | DS1251WP-120 | DS1251WP-120+C01 |
| Description | Real Time Clock 4096K NV SRAM w/Phantom Clock | Real Time Clock 4096K NV SRAM w/Phantom Clock | Real Time Clock 4096K NV SRAM w/Phantom Clock |
| Manufacturer | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | - | Y |
| Mounting Style | SMD/SMT | - | - |
| Package / Case | PowerCap Module-34 | - | - |
| RTC Bus Interface | Parallel | Parallel, Phantom Clock | - |
| Date Format | DW:DM:M:Y | DW:DM:M:Y | - |
| Time Format | HH:MM:SS:hh | HH:MM:SS:hh | - |
| Battery Backup Switching | Backup Switching | - | - |
| RTC Memory Size | 512 kB | 524288 B | - |
| Supply Voltage Max | 3.63 V | 3.63 V | 3.63 V |
| Supply Voltage Min | 2.97 V | 2.97 V | 2.97 V |
| Minimum Operating Temperature | 0 C | 0 C | - |
| Maximum Operating Temperature | + 70 C | + 70 C | - |
| Packaging | Tube | Bulk | Bulk |
| Function | Calendar, Clock, NV Timekeeping RAM | - | - |
| Product | Real Time Clocks | - | - |
| Series | DS1251WP | DS1251WP | DS1251WP |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Moisture Sensitive | Yes | - | - |
| Operating Supply Current | 85 mA | - | - |
| Product Type | Real Time Clock | Real Time Clocks | Real Time Clocks |
| Factory Pack Quantity | 40 | 40 | 1 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Part # Aliases | 90-1251W+P12 DS1251WP | DS1251WP | DS1251WP |