Datasheet Texas Instruments BQ4845
| Manufacturer | Texas Instruments |
| Series | BQ4845 |

RTC IC W NVSRAM Control, Watchdog Timer, uP Reset, Interrupts and Battery Low Warning
Datasheets
Parallel RTC With CPU Supervisor datasheet
PDF, 1.6 Mb, File published: Sep 5, 1999
Extract from the document
Status
| BQ4845P-A4 | BQ4845S-A4 | BQ4845S-A4G4 | BQ4845S-A4N | BQ4845S-A4NG4 | BQ4845S-A4NTR | BQ4845S-A4NTRG4 | BQ4845S-A4TR | BQ4845S-A4TRG4 | |
|---|---|---|---|---|---|---|---|---|---|
| Lifecycle Status | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | Lifebuy (Manufacturer has announced that the device will be discontinued, and a lifetime-buy period is in effect) | NRND (Not recommended for new designs) | NRND (Not recommended for new designs) |
| Manufacture's Sample Availability | No | No | No | No | No | No | No | No | No |
Packaging
| BQ4845P-A4 | BQ4845S-A4 | BQ4845S-A4G4 | BQ4845S-A4N | BQ4845S-A4NG4 | BQ4845S-A4NTR | BQ4845S-A4NTRG4 | BQ4845S-A4TR | BQ4845S-A4TRG4 | |
|---|---|---|---|---|---|---|---|---|---|
| N | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Pin | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Package Type | N | DW | DW | DW | DW | DW | DW | DW | DW |
| Industry STD Term | PDIP | SOIC | SOIC | SOIC | SOIC | SOIC | SOIC | SOIC | SOIC |
| JEDEC Code | R-PDIP-T | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G | R-PDSO-G |
| Package QTY | 13 | 20 | 20 | 20 | 20 | 1000 | 1000 | 1000 | |
| Carrier | TUBE | TUBE | TUBE | TUBE | TUBE | LARGE T&R | LARGE T&R | LARGE T&R | |
| Device Marking | 4845P | 4845S | 4845S | 4845S-N | -A4 | 4845S-N | 4845S-N | 4845S | |
| Width (mm) | 13.71 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 | 7.5 |
| Length (mm) | 36.32 | 17.9 | 17.9 | 17.9 | 17.9 | 17.9 | 17.9 | 17.9 | 17.9 |
| Thickness (mm) | 5.08 | 2.35 | 2.35 | 2.35 | 2.35 | 2.35 | 2.35 | 2.35 | 2.35 |
| Pitch (mm) | 2.54 | 1.27 | 1.27 | 1.27 | 1.27 | 1.27 | 1.27 | 1.27 | 1.27 |
| Max Height (mm) | 5.08 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 | 2.65 |
| Mechanical Data | Download | Download | Download | Download | Download | Download | Download | Download | Download |
Eco Plan
| BQ4845P-A4 | BQ4845S-A4 | BQ4845S-A4G4 | BQ4845S-A4N | BQ4845S-A4NG4 | BQ4845S-A4NTR | BQ4845S-A4NTRG4 | BQ4845S-A4TR | BQ4845S-A4TRG4 | |
|---|---|---|---|---|---|---|---|---|---|
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Compliant | Not Compliant |
| Pb Free | Yes | No |
Application Notes
- U-502 Time-Base Oscillator for RTC ICPDF, 313 Kb, File published: Sep 5, 1999
Time-Base Oscillator for RTC ICs.The operation of the time-base oscillator is critical to the timekeeping functions of the bq3285, bq4285, and bq4845 series of real-time-clocks (RTCs). This application note describes some basic characteristics of the piezoelectric crystal and the on-chip crystal oscillator circuitry designed into these RTC series. It also includes suggestions for achieving timek - U-500 Using the bq4845 for a Low-Cost RTC/NVSRAM SubsystemPDF, 332 Kb, File published: Sep 5, 1999
Using the bq4845 for a Low-Cost RTC/NVSRAM Subsystem.The bq4845 combines on one IC a low-power real-time clock (RTC), a microcontroller supervisor, and a nonvolatile control circuit for static RAM. The part is the basis of a low-cost, reliable RTC plus nonvolatile SRAM subsystem for many embedded applications. This application note discusses the key aspects of bq4845 operation: component sele
Model Line
Series: BQ4845 (9)
Manufacturer's Classification
- Semiconductors> Clock and Timing> Real-time Clocks