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| PartNumber | DS1339U-3+T\u0026R | DS1339U-3+ | DS1339U-33 |
| Description | Real Time Clock I2C Serial RTC | Real Time Clock I2C Serial RTC | Real Time Clock I2C Serial RTC |
| Manufacturer | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Category | Real Time Clock | Real Time Clock | Real Time Clock |
| RoHS | Y | Y | N |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | uSOP | MSOP-8 | uSOP |
| RTC Bus Interface | Serial | Serial, I2C | Serial |
| Time Format | HH:MM:SS | HH:MM:SS | HH:MM:SS |
| Battery Backup Switching | Backup Switching | Backup Switching | Backup Switching |
| Supply Voltage Max | 3.3 V | 3.3 V | 5.5 V |
| Supply Voltage Min | 2.7 V | 2.7 V | 2.97 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Reel | Tube | Tube |
| Function | Alarm, Calendar, Clock, Trickle Charger | Alarm, Calendar, Clock, Trickle Charger | Alarm, Calendar, Clock, Trickle Charger |
| Product | Real Time Clocks | Real Time Clocks | - |
| Series | DS1339U | DS1339U | DS1339U |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Type | Real Time Clock | Real Time Clock | Real Time Clocks |
| Factory Pack Quantity | 3000 | 50 | 50 |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | Clock & Timer ICs |
| Part # Aliases | 90-1339U+3TR DS1339U | 90-1339U+003 DS1339U | 90-1339U-033 DS1339U |
| Date Format | - | YY-MM-DD | - |
| Operating Supply Current | - | 450 uA | - |
| Unit Weight | - | 0.004938 oz | - |