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bq3285E

Features: Direct clock/calendar replacement for IBM AT-compatible computers and other applications Functionally compatible with the DS1285 - Closely matches MC146818A pin configuration 2.73.6V operation (bq3285L); 4.55.5V operation (bq3285E) 242 bytes of general nonvolatile storage 32.768kHz outpu...

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SeekIC No. : 004301293 Detail

bq3285E: Features: Direct clock/calendar replacement for IBM AT-compatible computers and other applications Functionally compatible with the DS1285 - Closely matches MC146818A pin configuration 2.73.6V opera...

bq3285E Data Sheet

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Part Number:
bq3285E
Supply Ability:
5000

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  • 1~5000
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  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/21

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Product Details

Description



Features:

Direct clock/calendar replacement for IBM AT-compatible computers and other applications
Functionally compatible with the DS1285
   - Closely matches MC146818A pin configuration
2.73.6V operation (bq3285L); 4.55.5V operation (bq3285E)
242 bytes of general nonvolatile storage 32.768kHz output for power management
System wake-up capability-alarm interrupt output active in battery-backup mode
Less than 0.5A load under bat-tery operation
Selectable Intel or Motorola bus timing
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 out-put
Three individually maskable interrupt event flags:
   - Periodic rates from 122s to 500ms
   - Time-of-day alarm once per second to once per day
   - End-of-clock update cycle
24-pin plastic DIP,SOIC,orSSOP


Pinout

Connection Diagram


Specifications

Symbol Parameter Value Unit Conditions
VCC DC voltage applied on VCC relative to VSS -0.3 to 7.0 V
VT DC voltage applied on any pin excluding VCC
relative to VSS		 -0.3 to 7.0 V VT VCC + 0.3
TOPR Operatingtemperature 0 to +70 °C Commercial
TSTG Storage temperature -55 to +125 °C
TBIAS Temperature under bias -40 to +85 °C
TSOLDER Soldering temperature 260 °C For 10 seconds



Description

The CMOS bq3285E/L is a lowpower microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. The bq3285L supports 3V systems. Other bq3285E/L features include three maskable interrupt sources, square-wave output, and 242 bytes ofgeneralnonvolatilestorage.


A 32.768kHz output of bq3285E is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which isactiveinbattery-backupmode.


The bq3285E/L write-protects the clock, calendar, and storage registers during power failure. A backup battery then maintains data and operatestheclockandcalendar.


The bq3285E/L 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.




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