BQ3285LF Status: ACTIVE

Y2K Enhanced ACPI Compliant RTC IC w 240x8 NVSRAM, Alarm Wake-up 3.3V op 32kHz Dedicated Output

      
         
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Datasheet

Download - PDF Icon
  • Y2K-Enhanced Real-TIme Clock (RTC) (bq3285lf.pdf, 187 KB)
    05 Sep 1999 Download

 BQ3285 BQ3285E BQ3285LD BQ3285LF
Supply Voltage(V)5  5  3  3  
Bus InterfaceMultiplexed  Multiplexed  Multiplexed  Multiplexed  
Memory Density(Kb)0.114  0.242  0.242  0.242  
Operating Temp Range(Celsius)0 to 70  0 to 70  0 to 70   
Pin/Package24PDIP,24SOIC  24PDIP,24SOIC,24SSOP/QSOP  24SSOP/QSOP  24SSOP/QSOP  
Approx. Price (US$) 2.10 | 1ku   2.10 | 1ku   2.10 | 1ku   2.10 | 1ku  
RTC Bytes 14  14  14  
 SamplesSamplesSamplesSamples
 InventoryInventoryInventoryInventory

Customers Who Evaluated This Product Also Evaluated

  • BQ4802LY: Y2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V Vcc
  • BQ3285LD: ACPI Compliant RTC IC W 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output 3V Op on L Version
  • BQ32000: Serial RTC

Product Information

Features

  • ACPI-compliant day-of-month alarm
  • Y2K century bit
  • Direct clock/calendar replacement for IBM ® AT-compatible computers and other applications
  • 2 index shadow registers
  • 2.7�5.5V operation
  • 240 bytes of general nonvolatile storage
  • Dedicated 32.768kHz output pin
  • System wake-up capability�alarm interrupt output active in battery-backup mode
  • Less than 0.55uA load under battery operation
  • Selectable Intel or Motorola bus timing
  • 24-pin plastic SSOP

Description

The CMOS bq3285LF is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The architecture is based on the bq3285 RTC with added features: century bit, low-voltage operation, 32.768kHz output, 126 additional bytes of CMOS, two shadow registers of last address used, and a day-of-month alarm to be compliant with the ACPI RTC specification.

A 32.768kHz output is available for sustaining power-management activities. The bq3285LF 32kHz output is always on whenever VCC is valid. In VCC standby mode, the 32kHz is active, and the bq3285LF typically draws 100uA. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode. In battery-backup mode, current drain is less than 550nA.

The bq3285LF write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.

The bq3285LF is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.

The bq3285LF is intended for use in 3V systems; however, it may also operate at 5V and then go into a 3V power-down state, write-protecting as if in a 3V system.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusPrice | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
BQ3285LFSS-A1ACTIVE2.10 | 1kuSSOP/QSOP (DBQ) | 24 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285LFSS-A1G4ACTIVE2.10 | 1kuSSOP/QSOP (DBQ) | 24 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285LFSS-A1TRACTIVE2.10 | 1kuSSOP/QSOP (DBQ) | 24 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ3285LFSS-A1TRG4ACTIVE2.10 | 1kuSSOP/QSOP (DBQ) | 24 View 2500 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

  TI Inventory Status Reported Distributor Inventory
BQ3285LFSS-A1As of 10:11 AM GMT, 04 Dec 2008As of 10:11 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 2900 | 2 Jan 4 Weeks AmericasArrow 30
  DigiKey 82
  Rochester Electronics >1k
  EuropeFarnell 59
BQ3285LFSS-A1G4As of 10:11 AM GMT, 04 Dec 2008As of 10:11 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 2900 | 2 Jan 4 Weeks None Reported
View Distributors
   
BQ3285LFSS-A1TRAs of 10:11 AM GMT, 04 Dec 2008As of 10:11 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 1862 | 11 Dec 6 Weeks AmericasRochester Electronics >1k
 >10k | 12 Jan EuropeSpoerle >1k
BQ3285LFSS-A1TRG4As of 10:11 AM GMT, 04 Dec 2008As of 10:11 AM GMT, 04 Dec 2008
 In StockIn Progress QTY | DateLead TimeRegionCompanyIn StockPurchase
 0* 1862 | 11 Dec 6 Weeks None Reported
View Distributors
   
 >10k | 12 Jan     
View all Distributors  

* Our information is updated daily, so please check back with us soon if this does not meet your needs. You may also contact your TI Authorized Distributor , including those listed above, for real time stock information.

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

 Product ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
BQ3285LFSS-A1 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ3285LFSS-A1G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ3285LFSS-A1TR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
BQ3285LFSS-A1TRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Datasheets

  • Y2K-Enhanced Real-TIme Clock (RTC) (bq3285lf.pdf, 187 KB)
    05 Sep 1999 Download

Application Notes

  • U-502 Time-Base Oscillator for RTC IC (slua051.htm, 8 KB)
    05 Sep 1999 Abstract
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Customers Who Evaluated This Product Also Evaluated...
Part #Name Comments
BQ4802LYY2K-Compliant Parallel RTC with CPU Supervisor and External NVSRAM Control, 3V VccTI customers also evaluated this product.
BQ3285LDACPI Compliant RTC IC W 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output 3V Op on L VersionTI customers also evaluated this product.
BQ32000Serial RTCTI customers also evaluated this product.

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