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BQ3285 Status: ACTIVE

RTC IC with 114x8 NVSRAM


      
         
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Datasheet

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 BQ3285BQ3285E 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

Product Information

Features

  • Direct clock/calendar replacement for IBM® AT-compatible computers and other applications
  • Functionally compatible with the DS1285
    • Closely matches MC146818A pin configuration
  • 114 bytes of general nonvolatile storage
  • 160ns cycle time allows fast bus operation
  • Selectable Intel or Motorola bus timing
  • Less than 0.5µA load under battery operation
  • 14 bytes for clock/calendar and control
  • BCD or binary format for clock and calendar data
  • Calendar in day of the week, day of the month, months, and years, with automatic leap-year adjustment
  • Time of day in seconds, minutes, and hours
    • 12- or 24-hour format
    • Optional daylight saving adjustment
  • Programmable square wave output
  • Three individually maskable interrupt event flags:
    • Periodic rates from 122us to 500ms
    • Time-of-day alarm once per second to once per day
    • End-of-clock update cycle
  • 24-pin plastic DIP or SOIC

Description

The CMOS bq3285 is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.

The bq3285 write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operates the clock and calendar.

The bq3285 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.

    

Pricing / Packaging / CAD Design Tools / Samples

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
BQ3285P-SB2ACTIVE0 to 702.10 | 1kuPDIP (N) | 24 View 15 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285P-SB2E3ACTIVE0 to 702.10 | 1kuPDIP (N) | 24 View 15 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285S-SB2ACTIVE0 to 702.35 | 1kuSOIC (DW) | 24 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285S-SB2G4ACTIVE0 to 702.35 | 1kuSOIC (DW) | 24 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285S-SB2TRACTIVE0 to 702.10 | 1kuSOIC (DW) | 24 View 2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
BQ3285S-SB2TRG4ACTIVE0 to 702.10 | 1kuSOIC (DW) | 24 View 2000 | 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

Reported Distributor Inventory as of 12:06 PM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 4 WeeksBQ3285P-SB2
AmericasAvnet 90
Rochester Electronics >1k
WorldwideDigiKey 394
TI Lead Time*: 4 WeeksBQ3285P-SB2E3
None Reported
View Distributors
TI Lead Time*: 4 WeeksBQ3285S-SB2
AmericasArrow 20
Newark 125
Rochester Electronics 200
AsiaFarnell Asia 125
EuropeAbacus Polar 25
EBV Elektronik 50
WorldwideDigiKey 262
Mouser Electronics 4
TI Lead Time*: 4 WeeksBQ3285S-SB2G4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksBQ3285S-SB2TR
AmericasRochester Electronics >1k
EuropeAbacus Polar >1k
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksBQ3285S-SB2TRG4
WorldwideDigiKey  Available
View all Distributors  

** 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
BQ3285P-SB2 RoHS Compliant Pb-Free (RoHS) A42 SN N/A for Pkg TypeViewView
BQ3285P-SB2E3 RoHS Compliant Pb-Free (RoHS) A42 SN N/A for Pkg TypeViewView
BQ3285S-SB2 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ3285S-SB2G4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ3285S-SB2TR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
BQ3285S-SB2TRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView

* 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

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Datasheet

Application Notes

Customers Who Evaluated This Product Also Evaluated...
Part # Name Product Family Comments
BQ32000 Serial RTC CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
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