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| PartNumber | BQ4845YS-A4NTRG4 | BQ4845YS-A4NTR | BQ4845YS-A4N |
| Description | Real Time Clock RTC IC W NVSRAM Control | Real Time Clock w/NVSRAM Control Watchdog Time | Real Time Clock w/NVSRAM Control Watchdog Time |
| Manufacturer | - | TI | Texas Instruments |
| Product Category | - | Clock/Timing - Real Time Clocks | Clock/Timing - Real Time Clocks |
| Series | - | BQ4845Y | BQ4845Y |
| Product | - | Real Time Clocks | Real Time Clocks |
| Type | - | Clock/Calendar | Clock/Calendar |
| Packaging | - | Tape & Reel (TR) Alternate Packaging | Tube Alternate Packaging |
| Unit Weight | - | 0.025778 oz | 730800 mg |
| Mounting Style | - | SMD/SMT | SMD/SMT |
| Package Case | - | SOIC-28 | 28-SOIC (0.295", 7.50mm Width) |
| Operating Temperature | - | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount | Surface Mount |
| Features | - | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer | Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer |
| Function | - | Alarm Calendar Clock Timer Interrupt | Alarm Calendar Clock Timer Interrupt |
| Interface | - | Parallel | Parallel |
| Voltage Supply | - | 4.5 V ~ 5.5 V | 4.5 V ~ 5.5 V |
| Supplier Device Package | - | 28-SOIC | 28-SOIC |
| Memory Size | - | - | - |
| Time Format | - | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) |
| Date Format | - | YY-MM-DD-dd | YY-MM-DD-dd |
| Voltage Supply Battery | - | 2.3 V ~ 4 V | 2.3 V ~ 4 V |
| Current Timekeeping Max | - | 1.5mA (Typ) @ 4.5 V ~ 5.5 V | 1.5mA (Typ) @ 4.5 V ~ 5.5 V |
| Maximum Operating Temperature | - | + 85 C | + 85 C |
| Minimum Operating Temperature | - | - 40 C | - 40 C |
| Battery Backup Switching | - | Backup Switching | Backup Switching |
| Supply Voltage Max | - | 5.5 V | 5.5 V |
| Supply Voltage Min | - | 4.5 V | 4.5 V |
| RTC Bus Interface | - | Parallel | Parallel |
| RTC Memory Size | - | 16 B | 16 B |