BQ3285 |
RFQ for BQ3285 Required Field |
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| Technical/Catalog Information | BQ3285ECSS |
| Vendor | Texas Instruments |
| Category | Integrated Circuits (ICs) |
| Date Format | YY-MM-DD-dd |
| Time Format | HH:MM:SS (12/24 hr) |
| Voltage - Supply | 4.5 V ~ 5.5 V |
| Interface | Parallel |
| Memory Size | 242B |
| Package / Case | 24-QSOP (SSOP) |
| Packaging | Tube |
| Type | Clock/Calendar/NVSRAM |
| Operating Temperature | 0°C ~ 70°C |
| Drawing Number | 296; 4073301-4; DBQ; 24 |
| Lead Free Status | Contains Lead |
| RoHS Status | RoHS Non-Compliant |
| Other Names | BQ3285ECSS BQ3285ECSS 296 2593 5 ND 29625935ND 296-2593-5 |
| Product | Manufacturers | Pack | D/C |
| BQ3285 | - | SOP | 07/08+ |
The CMOS bq3285 is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and batery operation. Other features inlude three maskable interrupt ources, square wave output, and 114 bytesofgeneralnonvolatilestorage.
The bq3285 write-protects the clock,calendar, and storage registers during power failure. A backup battery then maintains data and operates the clockandcalendar.
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.
Features |
| Direct clock/calendar replace-ment 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 0.5A load under bat-tery operation 14 bytes for clock/calendar and control BCD or binary format for clock and calendar dataCalendar in day of the week,day of the month,months,and years,with automatic leap-year adjust-ment 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 or SOIC |
| 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 |
