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BQ4845S-A4NTR Texas Instruments BQ4845S-A4NTR is a real time clock IC with integrated supervisor, watchdog timer, and alarm features in a 28-SOIC package. It operates on 4.5V to 5.5V supply and draws 1.5mA typical current.
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BQ4845S-A4NTR

Available from 1 distributors
Mfr Name: Texas Instruments
Texas Instruments
Texas Instruments BQ4845S-A4NTR is a real time clock IC with integrated supervisor, watchdog timer, and alarm features in a 28-SOIC package. It operates on 4.5V to 5.5V supply and draws 1.5mA typical current.
✓ Total Stock: 253 pcs

BQ4845S-A4NTR Available from 1 distributor

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253 pcs
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BQ4845S-A4NTR Specifications Quick View

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BQ4845S-A4NTR Description

Short technical summary and product information.

The BQ4845S-A4NTR from Texas Instruments is a low-power real time clock (RTC) peripheral designed for microprocessor-based systems. It provides a time-of-day clock, 100-year calendar, and a CPU supervisor function in a compact 28-pin SOIC package. Key features include alarm, daylight savings, leap year, supervisor, and watchdog timer capabilities. The device supports 12/24 hour time format and YY-MM-DD-dd date format via a parallel interface.

 

This RTC operates from a 4.5V to 5.5V supply and consumes a typical supply current of 1.5mA. It includes a backup battery input supporting 2.3V to 4V, with a maximum backup current of only 500nA, ensuring long battery life during power loss. An on-chip 32.768kHz crystal oscillator provides accurate timing.

 

The BQ4845S-A4NTR also integrates a microprocessor reset function that holds reset active for 200ms after power supply stabilization. The independent watchdog timer with programmable timeout enhances system reliability. The device is housed in a surface mount 28-SOIC (0.295", 7.50mm width) package and is rated for operation from -40°C to 85°C ambient temperature.

BQ4845S-A4NTR Quick Information

Product Type: Real Time Clock (RTC) IC
Canonical Name: Texas Instruments BQ4845S-A4NTR Real Time Clock with Supervisor and Watchdog Timer
Subcategory: Clock/Timing - Real Time Clocks

BQ4845S-A4NTR Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

BQ4845S-A4NTR Features

  • Real-time clock with alarm and calendar.
  • Integrated watchdog timer and supervisor.
  • Low backup current of 500nA maximum.
  • Parallel interface with 12/24 hour format.
  • Operating temperature range -40°C to 85°C.

BQ4845S-A4NTR Applications

  • Used in industrial control systems and data loggers.
  • Suitable for point-of-sale terminals and computers.
  • Ideal for fax machines and copier equipment.
  • Deployed in microprocessor-based supervisory circuits.

BQ4845S-A4NTR FAQs

7 frequently asked questions generated from this part’s specifications.
What is the supply voltage range for the BQ4845S-A4NTR?

The supply voltage range is 4.5V to 5.5V.

What is the operating temperature range?

The operating temperature range is -40°C to 85°C.

What is the standby current in backup mode?

The maximum backup current is 500nA at 3V battery.

What package is the BQ4845S-A4NTR available in?

It is available in a 28-SOIC (0.295", 7.50mm width) surface mount package.

Does the BQ4845S-A4NTR have a watchdog timer?

Yes, it has an independent watchdog timer with programmable timeout.

What is the reset timeout after power supply stabilization?

The reset stays active for 200ms typical after VCC rises within tolerance.

What is the RoHS status?

The part is RoHS3 compliant (unverified).

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