Features: Direct clock/calendar replace-ment for IBM AT-compatible computersandotherapplications Functionally compatible with the DS1287/DS1287AandMC146818A 114 bytes of general nonvolatile storage Integrallithiumcellandcrystal 160 ns cycle time allows fast bus operation Selectable Intel or Motoro...
bq3287: Features: Direct clock/calendar replace-ment for IBM AT-compatible computersandotherapplications Functionally compatible with the DS1287/DS1287AandMC146818A 114 bytes of general nonvolatile storage ...
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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 |
-20 to+70 | Extended "I" | |||
TSTG | Storage temperature | -40 to +70 | °C | Commercial |
-40 to +70 | °C | Extended "I" | ||
TBIAS | Temperature under bias | -10 to +70 | °C | Commercial |
-20 to +70 | °C | Extended "I" | ||
TSOLDER | Soldering temperature | 260 | °C | For 10 seconds |
The CMOS bq3287/bq3287A 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, quare- wave output, and 114 bytes of gen-eral nonvolatile storage. Thebq3287A version is identical to the bq3287,with the addition of the RAM clearinput.
The bq3287 is a fully compatible real-time clock for IBM AT-compatible computers and other applications. The bq3287 write-protects the clock, calendar, and storage registers during power fail-ure. The integral backup energy source then maintains data and operatestheclockandcalendar.
As shipped from Benchmarq, the real time clock of bq3287 is turned off to maxi-mize battery capacity for in-system operation.
The bq3287 is functionally equivalent to the bq3285, except that the battery (16, 20) and crystal (2, 3) pins are not accessible. These pins are connected internally to a coin cell and quartz crystal. The coin cell is sized to provide 10 years of data retention and clock operation in the absence of power. For a complete description of features, operating conditions, electrical characteristics, bus timing, and pin descriptions, see the bq3285 data sheet.