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BQ3285 Datasheet(PDF) 1 Page - Texas Instruments |
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BQ3285 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 26 page  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 0.5 µA load under bat- tery 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 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 in- terrupt event flags: - Periodic rates from 122µs to 500ms - Time-of-day alarm once per second to once per day - End-of-clock update cycle ® 24-pin plastic DIP or SOIC General Description The CMOS bq3285 is a low-power microprocessor peripheral providing a time-of-day clock and 100-year cal- endar with alarm features and bat- tery operation. Other features in- clude 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 com- patible computers and other appli- cations. The only external compo- nents are a 32.768kHz crystal and a backup battery 1 bq3285 Real-Time Clock (RTC) 28-Pin PLCC No longer available Pin Names AD0–AD7 Multiplexed address/data input/output MOT Bus type select input CS Chip select input AS Address strobe input DS Data strobe input R/W Read/write input INT Interrupt request output RST Reset input SQW Square wave output RCL RAM clear input BC 3V backup cell input X1–X2 Crystal inputs NC No connect VCC +5V supply VSS Ground 1 PN328501.eps 24-Pin DIP or SOIC 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 9 10 16 15 11 12 14 13 VCC SQW NC BC INT RST DS VSS R/W AS CS MOT X1 X2 AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 VSS RCL Pin Connections SLUS028A - JUNE 1991 - REVISED - MAY 2004 |
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