BQ3285 - TI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

BQ3285
Manufacturer

TI
ChipWorker Part#

CW294659228
RoHS

Lead free / RoHS Compliant
Description

Real-Time Clock (RTC)
Documentation

Datasheet

BQ3285 Global Supplier

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BQ3285 Specifications

Attribute	Attribute Value

Part Number	BQ3285
Manufacturer	TI
ChipWorker Part#	CW294659228
Documentation	Datasheet
Case/Package	PDIP-24
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RoHS	RoHS Compliant
Lead-Free Status	Lead Free

Product Description

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

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- Carefully tested and packaged by ChipWorker
- Vacuum packed
- Anti-static packaging
- Anti-vibration foam
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- Decapsulation control
- X-ray inspection
- XRF inspection
- Electrical testing
- Surface testing

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