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| PartNumber | DS1643P-100+ | DS1643P-120 |
| Description | Real Time Clock NV Timekeeping RAM | Real Time Clock, Non-Volatile, 34 Pin, Plastic |
| Manufacturer | Maxim Integrated | - |
| Product Category | Real Time Clock | - |
| RoHS | Y | - |
| Mounting Style | SMD/SMT | - |
| Package / Case | PowerCap Module-34 | - |
| RTC Bus Interface | Parallel | - |
| Date Format | DW:DM:M:Y | - |
| Time Format | HH:MM:SS | - |
| RTC Memory Size | 8 kB | - |
| Supply Voltage Max | 5.5 V | - |
| Supply Voltage Min | 4.5 V | - |
| Minimum Operating Temperature | 0 C | - |
| Maximum Operating Temperature | + 70 C | - |
| Packaging | Tube | - |
| Function | Calendar, Clock, NV Timekeeping RAM | - |
| Series | DS1643P | - |
| Brand | Maxim Integrated | - |
| Moisture Sensitive | Yes | - |
| Product Type | Real Time Clocks | - |
| Factory Pack Quantity | 40 | - |
| Subcategory | Clock & Timer ICs | - |
| Part # Aliases | 90-1643P+100 DS1643P | - |