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| PartNumber | DS1339U-2+ | DS1339U-2+T\u0026R | DS1339U-2+T |
| Description | 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 | Clock/Timing - Real Time Clocks |
| RoHS | Y | Y | - |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | uSOP-8 | uSOP | - |
| RTC Bus Interface | Serial | Serial | Serial |
| Time Format | HH:MM:SS | HH:MM:SS | HH:MM:SS (12/24 hr) |
| Battery Backup Switching | Backup Switching | Backup Switching | Backup Switching |
| Supply Voltage Max | 2.2 V | 2.2 V | - |
| Supply Voltage Min | 1.8 V | 1.8 V | - |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Tube | Reel | Tape & Reel (TR) Alternate Packaging |
| Function | Alarm, Calendar, Clock, Trickle Charger | Alarm, Calendar, Clock, Trickle Charger | Alarm Calendar Clock Trickle Charger |
| Product | Real Time Clocks | Real Time Clocks | Real Time Clocks |
| Series | DS1339U | DS1339U | DS1339U |
| Brand | Maxim Integrated | Maxim Integrated | - |
| Product Type | Real Time Clock | Real Time Clock | - |
| Factory Pack Quantity | 50 | 3000 | - |
| Subcategory | Clock & Timer ICs | Clock & Timer ICs | - |
| Part # Aliases | 90-1339U+002 DS1339U | 90-1339U+2TR DS1339U | 90-1339U+2TR DS1339U |
| Unit Weight | 0.000832 oz | - | - |
| Type | - | - | Clock/Calendar |
| Package Case | - | - | uSOP |
| Operating Temperature | - | - | -40°C ~ 85°C |
| Mounting Type | - | - | Surface Mount |
| Features | - | - | Alarm, Leap Year, Square Wave Output, Trickle-Charger |
| Interface | - | - | I2C, 2-Wire Serial |
| Voltage Supply | - | - | 1.8 V ~ 5.5 V |
| Supplier Device Package | - | - | 8-uMAX |
| Memory Size | - | - | - |
| Date Format | - | - | YY-MM-DD-dd |
| Voltage Supply Battery | - | - | 1.3 V ~ 3.7 V |
| Current Timekeeping Max | - | - | 100μA @ 2.2V |
| Supply Voltage Max | - | - | 2.2 V |
| Supply Voltage Min | - | - | 1.8 V |