BQ3285EP The BQ3285EP is a low-power real-time clock from Texas Instruments providing time-of-day and calendar functions with 242 bytes of nonvolatile storage. It features a parallel interface, alarm, and square wave output in a 24-pin PDIP package.
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BQ3285EP

Available from 1 distributors
Mfr Name: Texas Instruments
Texas Instruments
The BQ3285EP is a low-power real-time clock from Texas Instruments providing time-of-day and calendar functions with 242 bytes of nonvolatile storage. It features a parallel interface, alarm, and square wave output in a 24-pin PDIP package.
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BQ3285EP Available from 1 distributor

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BQ3285EP Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
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Features
Interface
Memory Size
Mounting Type
Operating Temperature
Supplier Device Package
Time Format
Type
Voltage

BQ3285EP Description

Short technical summary and product information.

The Texas Instruments BQ3285EP is a CMOS real-time clock (RTC) peripheral designed for low-power operation. It integrates a time-of-day clock and 100-year calendar with alarm features, along with 242 bytes of general-purpose nonvolatile SRAM (NVSRAM). The device supports both 12-hour and 24-hour time formats and includes automatic leap-year adjustment and daylight saving time adjustment.

 

The BQ3285EP operates from a 2.5V to 4V supply and draws a typical current of 300 µA at 5V. It provides a programmable square wave output and three individually maskable interrupt sources: periodic rates, time-of-day alarm, and end-of-clock update cycle. The device also includes a 32.768kHz output for power management and system wake-up capability via the alarm interrupt, which remains active in battery-backup mode.

 

This RTC is housed in a 24-pin DIP package (0.600" body width) with through-hole mounting, making it suitable for legacy and industrial applications. The part is RoHS3 compliant and has an MSL of 1 (unlimited).

BQ3285EP Quick Information

Product Type: Real-Time Clock (RTC)
Canonical Name: Texas Instruments BQ3285EP Real-Time Clock (RTC) with 242B NVSRAM, Parallel Interface, 24-PDIP
Subcategory: Clock/Calendar

BQ3285EP Compliance

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

BQ3285EP Features

  • Real-time clock with 242 bytes NVSRAM.
  • Parallel interface for easy integration.
  • Alarm, daylight savings, and leap year support.
  • Programmable square wave output.
  • Operates from 2.5V to 4V supply.

BQ3285EP Applications

  • IBM AT-compatible computer clock replacement.
  • Industrial control systems requiring timekeeping.
  • Embedded systems with battery-backed RTC needs.
  • Power management and system wake-up applications.

BQ3285EP FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating voltage range of the BQ3285EP?

The BQ3285EP operates from 2.5V to 4V.

What package does the BQ3285EP come in?

The BQ3285EP is available in a 24-pin DIP package (0.600", 15.24mm) with through-hole mounting, also known as 24-PDIP.

What is the operating temperature range of the BQ3285EP?

The BQ3285EP is rated for operation from 0°C to 70°C.

Is the BQ3285EP RoHS compliant?

The BQ3285EP is listed as RoHS3 compliant, though this status is unverified.

How much memory does the BQ3285EP have?

The BQ3285EP includes 242 bytes of nonvolatile SRAM (NVSRAM).

What interface does the BQ3285EP use?

The BQ3285EP uses a parallel interface.

Does the BQ3285EP support alarm functions?

Yes, the BQ3285EP includes alarm features, including a time-of-day alarm and system wake-up capability.

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