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| PartNumber | DS1390U-33+ | DS1390U-18+ | DS1390 |
| Description | Real Time Clock Low-V SPI/3-Wire With Trickle Charger | Real Time Clock Low-V SPI/3-Wire With Trickle Charger | |
| Manufacturer | Maxim Integrated | Maxim Integrated | - |
| Product Category | Real Time Clock | Real Time Clock | - |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | - |
| Package / Case | MSOP-10 | uSOP-10 | - |
| RTC Bus Interface | Serial, 3-Wire, SPI | Serial | - |
| Date Format | DW:DM:M:Y | - | - |
| Time Format | HH:MM:SS:hh | HH:MM:SS:hh | - |
| Battery Backup Switching | Backup Switching | Backup Switching | - |
| Supply Voltage Max | 5.5 V | 1.89 V | - |
| Supply Voltage Min | 2.97 V | 1.71 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - |
| Maximum Operating Temperature | + 85 C | + 85 C | - |
| Packaging | Tube | Tube | - |
| Function | Alarm, Calendar, Clock, Trickle Charger | Alarm, Calendar, Clock, Trickle Charger | - |
| Product | Real Time Clocks | Real Time Clocks | - |
| Series | DS1390U | DS1390U | - |
| Brand | Maxim Integrated | Maxim Integrated | - |
| Operating Supply Current | 2 mA | - | - |
| Product Type | Real Time Clock | Real Time Clock | - |
| Factory Pack Quantity | 50 | 50 | - |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | - |
| Part # Aliases | 90-1390U+033 DS1390U | 90-1390U+018 DS1390U | - |
| Unit Weight | 0.005051 oz | - | - |