BQ3285ECSS

The BQ3285ECSS is designed as one kind of lowpower microprocessor (real-time clock (RTC)) device that write-protects the clock, calendar, and storage registers during power failure. And this device is a fully compatible real-time clock for IBM ATcompatible computers and other applications.

Features of the BQ3285ECSS are:(1)Direct clock/calendar replacement for IBM?AT-compatible computers and other applications; (2)2.7 - 5.5V operation (bq3285LC); 4.5 - 5.5V operation (bq3285EC); (3)242 bytes of general nonvolatile storage; (4)Dedicated 32.768kHz output pin; (5)System wake-up capability alarm interrupt output active in battery-backup mode; (6)Less than 0.5mA load under battery operation; (7)Selectable Intel or Motorola bus timing; (8)24-pin plastic SOIC or SSOP.

The absolute maximum ratings of the BQ3285ECSS can be summarized as:(1)DC voltage applied on VCC relative to VSS: -0.3 to 7.0 V;(2)DC voltage applied on any pin excluding VCC relative to VSS: -0.3 to 7.0 V;(3)Operating temperature: 0 to +70 °C;(4)Storage temperature: -55 to +125 °C;(5)Temperature under bias: -40 to +85 °C;(6)Soldering temperature: 260 °C.

The electrical characteristics of BQ3285ECSS can be summarized as:(1)Oscillation frequency: 32.768 kHz;(2)Load capacitance: 6 pF;(3)Temperature turnover point: 20 to 30 °C;(4)Parabolic curvature cons: -0.042 ppm/°C;(5)Quality factor: 40,000 to 70,000;(6)Series resistance: 45 K;(7)Shunt capacitance: 1.1 to 1.8 pF;(8)Capacitance ratio: 430 to 600;(9)Drive level: 1 uW;(10)Aging (first year at 25°C): 1 ppm. If you want to know more information about it, please download the datasheet in www.seekic.com or www.chinaicmart.com .