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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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 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

  • BQ32000: Serial RTC
  • BQ3285LD: ACPI Compliant RTC IC W 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output 3V Op on L Version
  • BQ3285E: RTC IC with 242x8 NVSRAM Alarm Wake-up
  • TMP101: Digital Temperature Sensor with I2C Serial Interface, Prog. Thermostat/Alarm Function

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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-A1ACTIVE2.35 | 1kuSSOP/QSOP (DBQ) | 24 View 50 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
BQ3285LFSS-A1G4ACTIVE2.35 | 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

Reported Distributor Inventory as of 12:06 PM GMT, 08 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 20 WeeksBQ3285LFSS-A1
AmericasRochester Electronics >1k
AsiaFarnell Asia 34
EuropeAvnet-SILICA 50
Farnell 34
TI Lead Time*: 20 WeeksBQ3285LFSS-A1G4
None Reported
View Distributors
TI Lead Time*: 20 WeeksBQ3285LFSS-A1TR
AmericasRochester Electronics >1k
TI Lead Time*: 20 WeeksBQ3285LFSS-A1TRG4
None Reported
View Distributors
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
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

Most useful technical documents for BQ3285LF Help

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.
BQ3285LD ACPI Compliant RTC IC W 242x8 NVSRAM Alarm Wake-up Dedicated 32kHz Output 3V Op on L Version CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
BQ3285E RTC IC with 242x8 NVSRAM Alarm Wake-up CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
BQ3285 RTC IC with 114x8 NVSRAM CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
BQ3287E RTC Module With 242x8 NVSRAM, Alarm Wake-up, RAM Clear Input on EA Version CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
BQ4285E RTC IC With 114x8 NVSRAM and NVSRAM Control, Alarm Wake-up 3V Op on L Version CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
BQ3287 RTC Module with 114x8 NVSRAM, RAM Clear Input on A Version CLOCKS AND TIMERS-REAL-TIME CLOCKS TI customers also evaluated this product.
TMP101 Digital Temperature Sensor with I2C Serial Interface, Prog. Thermostat/Alarm Function TEMPERATURE SENSORS AND CONTROL ICs-TEMPERATURE SENSOR TI customers also evaluated this product.

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