BQ3287A, BQ3287AMT-1, BQ3287AMT-100 Selling Leads, Datasheet
MFG:BQ Package Cooled:DIP D/C:05+
BQ3287A, BQ3287AMT-1, BQ3287AMT-100 Datasheet download
Part Number: BQ3287A
MFG: BQ
Package Cooled: DIP
D/C: 05+
BQ3287A, BQ3287AMT-1, BQ3287AMT-100
- Table of contents:
Info of BQ3287A
Info of BQ3287AMT-1
Info of BQ3287AMT-100
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About bq3287A
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Datasheet: bq3287A
File Size: 78871 KB
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About BQ3285
PDF/DataSheet Download
Datasheet: BQ3285
File Size: 566717 KB
Manufacturer: TI [Texas Instruments]
Download : Click here to Download
About BQ3285
PDF/DataSheet Download
Datasheet: BQ3285
File Size: 566717 KB
Manufacturer: TI [Texas Instruments]
Download : Click here to Download
BQ3287A General Description
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 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.
BQ3287A Maximum Ratings
| 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 |
BQ3287A 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 Motorola bus timing 14 bytes for clock/calendar and control BCD or binary format for clock andcalendardata
Time of day in seconds, minutes, andhours
- 12- or 24-hour format
- Optional daylight saving adjustment
Calendar in day of the week, day of the month, months, and years with automatic leap-year adjust-ment
Programmable square wave output
Three individually maskable in-terrupteventflags:
- Periodic rates from 122sto 500 ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
Better than one minute per monthclockaccuracy
Functionally compatible with the DS1287/DS1287AandMC146818A
114 bytes of general nonvolatile storage
Integrallithiumcellandcrystal 160 ns cycle time allows fast bus operation
Selectable Intel or Motorola bus timing 14 bytes for clock/calendar and control BCD or binary format for clock andcalendardata
Time of day in seconds, minutes, andhours
- 12- or 24-hour format
- Optional daylight saving adjustment
Calendar in day of the week, day of the month, months, and years with automatic leap-year adjust-ment
Programmable square wave output
Three individually maskable in-terrupteventflags:
- Periodic rates from 122sto 500 ms
- Time-of-day alarm once per second to once per day
- End-of-clock update cycle
Better than one minute per monthclockaccuracy
BQ3287A Connection Diagram
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