BQ3285系列介绍资料

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BQ3285

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具有 114x8 NVSRAM 的 RTC IC

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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.

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

Function	Real-time clock
Iq (typ) (mA)	0.0005
Features	0.114-kB memory density, Multiplexed bus interface, RAM clear function
Rating	Catalog
Operating temperature range (°C)	0 to 70
Supply voltage (max) (V)	7
Supply voltage (min) (V)	-0.3

SOIC (DW)

159.65 mm² 15.5 x 10.3

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BQ3285

具有 114x8 NVSRAM 的 RTC IC

4000-306-326