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| PartNumber | DS1643-100+ | DS1643-100 | DS1643-70 |
| Description | Real Time Clock NV Timekeeping RAM | Real Time Clock NV Timekeeping RAM | Real Time Clock |
| Manufacturer | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | - | N |
| Mounting Style | Through Hole | Through Hole | Through Hole |
| Package / Case | eDIP-28 | eDIP | eDIP |
| RTC Bus Interface | Parallel | Parallel | Parallel |
| Time Format | HH:MM:SS | HH:MM:SS | HH:MM:SS |
| RTC Memory Size | 8 kB | 8 kB | 8 kB |
| Supply Voltage Max | 5.5 V | 5.5 V | 5.5 V |
| Supply Voltage Min | 4.5 V | 4.5 V | 4.5 V |
| Minimum Operating Temperature | 0 C | 0 C | 0 C |
| Maximum Operating Temperature | + 70 C | + 70 C | + 70 C |
| Packaging | Tube | Bulk | - |
| Function | Calendar, Clock, NV Timekeeping RAM | Calendar, Clock, NV Timekeeping RAM | Calendar, Clock, NV Timekeeping RAM |
| Series | DS1643 | DS1643 | DS1643 |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Type | Real Time Clocks | Real Time Clocks | Real Time Clock |
| Factory Pack Quantity | 12 | 12 | - |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Part # Aliases | 90-16430+100 DS1643 | DS1643 | DS1643 |
| Product | - | - | Real Time Clocks |