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BQ4845S-A4N The BQ4845S-A4N is a parallel real-time clock (RTC) with integrated CPU supervisor and watchdog timer. It features a clock/calendar with alarm, daylight savings, and leap year support in a 28-SOIC surface mount package.
Mfr Part #:

BQ4845S-A4N

Available from 1 distributors
Mfr Name: Texas Instruments
Texas Instruments
The BQ4845S-A4N is a parallel real-time clock (RTC) with integrated CPU supervisor and watchdog timer. It features a clock/calendar with alarm, daylight savings, and leap year support in a 28-SOIC surface mount package.
✓ Total Stock: 795 pcs

BQ4845S-A4N Available from 1 distributor

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✓ Non-Authorised
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Optech Co.,Limited ✓
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795 pcs
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795 pcs On Request 1 On Request On Request 17+ On Request On Request
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BQ4845S-A4N Specifications Quick View

Most important parameters for selection – full specs in datasheet.
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BQ4845S-A4N Description

Short technical summary and product information.

The BQ4845S-A4N from Texas Instruments is a low-power parallel real-time clock (RTC) that integrates a time-of-day clock, 100-year calendar, and CPU supervisor in a 28-pin SOIC package. It includes a watchdog timer, alarm interrupt, and periodic interrupt capabilities. The device operates from a 4.5V to 5.5V supply with a typical current of 1.5mA, and draws less than 500nA in backup mode from a 2.3V to 4V battery. Designed for industrial control systems, fax machines, point-of-sale terminals, and data loggers, the BQ4845S-A4N provides direct connections for a 32.768 kHz crystal and a 3V backup battery. It also features nonvolatile control for external SRAM, a microprocessor reset valid down to VSS, and a programmable watchdog timer. The surface-mount 28-SOIC package (7.5mm width) supports operating temperatures from -40°C to 85°C.

BQ4845S-A4N Quick Information

Product Type: Real Time Clock (RTC)
Series: BQ4845
Canonical Name: BQ4845S-A4N Parallel RTC with CPU Supervisor
Subcategory: Real Time Clocks

BQ4845S-A4N Compliance

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

BQ4845S-A4N Features

  • Integrated real-time clock with calendar.
  • CPU supervisor with watchdog timer.
  • Less than 500nA backup current.
  • Parallel interface for easy integration.
  • Surface mount 28-SOIC package.

BQ4845S-A4N Applications

  • Ideal for fax machines and copiers.
  • Used in industrial control systems.
  • Point-of-sale terminals and data loggers.
  • Embedded RTC with supervisor functions.
  • Nonvolatile SRAM subsystem applications.

BQ4845S-A4N FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating voltage range of the BQ4845S-A4N?

The supply voltage range is 4.5V to 5.5V.

What is the backup battery voltage range?

The backup battery voltage range is 2.3V to 4V.

What is the operating temperature range?

-40°C to 85°C.

What package is the BQ4845S-A4N available in?

28-SOIC (0.295", 7.50mm Width) surface mount package.

Is the BQ4845S-A4N RoHS compliant?

Yes, it is RoHS compatible (manufacturer stated).

What features does the BQ4845S-A4N include?

Alarm, daylight savings, leap year, supervisor, and watchdog timer.

What is the backup current in backup mode?

Less than 500nA (maximum).

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