Texas Instruments BQ4845S-A4NTRG4
Part Number:
- BQ4845S-A4NTRG4
Manufacturer:
- Texas Instruments
Ventron No:
- 3004960-BQ4845S-A4NTRG4
Description:
- IC RTC CLK/CALENDAR PAR 28-SOIC
Datasheet:
- BQ4845(Y)
Payment:
Delivery:
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Part Overview
Description
The bq4845 Real-Time Clock is a low-power microprocessor peripheral that integrates a time-of-day clock, a 100-year calendar, and a CPU supervisor in a 28-pin SOIC or DIP. It provides direct connections for a 32.768KHz quartz crystal and a 3V backup battery. Through the use of the conditional chip enable output (CEout) and battery voltage output (Vout) pins, the bq4845 can write-protect and make nonvolatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information in the absence of system voltage.
Features
Real-Time Clock counts seconds through years in BCD format
On-chip battery-backup switchover circuit with nonvolatile control for external SRAM
Less than 500mA of clock operation current in backup mode
Microprocessor reset valid to Vcc = Vss
Independent watchdog timer with a programmable time-out period
Power-fail interrupt warning
Programmable clock alarm interrupt active in battery-backup mode
Programmable periodic interrupt
Battery-low warning
Applications
Fax machines
Copiers
Industrial control systems
Point-of-sale terminals
Data loggers
Computers
The bq4845 Real-Time Clock is a low-power microprocessor peripheral that integrates a time-of-day clock, a 100-year calendar, and a CPU supervisor in a 28-pin SOIC or DIP. It provides direct connections for a 32.768KHz quartz crystal and a 3V backup battery. Through the use of the conditional chip enable output (CEout) and battery voltage output (Vout) pins, the bq4845 can write-protect and make nonvolatile external SRAMs. The backup cell powers the real-time clock and maintains SRAM information in the absence of system voltage.
Features
Real-Time Clock counts seconds through years in BCD format
On-chip battery-backup switchover circuit with nonvolatile control for external SRAM
Less than 500mA of clock operation current in backup mode
Microprocessor reset valid to Vcc = Vss
Independent watchdog timer with a programmable time-out period
Power-fail interrupt warning
Programmable clock alarm interrupt active in battery-backup mode
Programmable periodic interrupt
Battery-low warning
Applications
Fax machines
Copiers
Industrial control systems
Point-of-sale terminals
Data loggers
Computers
Specifications
Texas Instruments BQ4845S-A4NTRG4 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments BQ4845S-A4NTRG4.
- Contact PlatingGold
- MountSurface Mount
- Mounting TypeSurface Mount
- Package / Case28-SOIC (0.295, 7.50mm Width)
- Number of Pins28
- Weight730.794007mg
- Operating Temperature-40°C~85°C
- PackagingTape & Reel (TR)
- JESD-609 Codee4
- FeatureAlarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer
- Part StatusObsolete
- Moisture Sensitivity Level (MSL)1 (Unlimited)
- Number of Terminations28
- ECCN CodeEAR99
- HTS Code8542.39.00.01
- SubcategoryTimer or RTC
- TechnologyCMOS
- Voltage - Supply4.75V~5.5V
- Terminal PositionDUAL
- Peak Reflow Temperature (Cel)260
- Supply Voltage5V
- Terminal Pitch1.27mm
- Base Part NumberBQ4845
- Pin Count28
- Operating Supply Voltage5V
- Power Supplies5V
- InterfaceParallel
- Clock Frequency0.032MHz
- Logic FunctionClock
- External Data Bus Width8
- Number of Timers1
- Time FormatHH:MM:SS (12/24 hr)
- Date FormatYY-MM-DD-dd
- Current - Timekeeping (Max)1.5mA Typ @ 4.5 V~5.5 V
- Time-MinSECONDS
- Interrupt CapabilityY
- Voltage - Supply, Battery2.3V~4V
- VolatileNO
- Height Seated (Max)2.667mm
- Length17.9705mm
- Width7.5565mm
- Radiation HardeningNo
- RoHS StatusROHS3 Compliant
- Lead FreeLead Free
Certification
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