FEATURES
® Direct clock/calendar replacement for IBM® AT-compatible computers and other applications ® 114 bytes of general nonvolatile storage ® Enhanced features include: - System wake-up capability— alarm interrupt output active in battery-backup mode - 2.7–3.6V operation (bq4285L); 4.5–5.5V operation (bq4285E) - 32kHz output for power management ® Automatic backup and writeprotect control to external SRAM ® Functionally compatible with the DS1285 ® Less than 0.5 µA load under battery operation ® 14 bytes for clock/calendar and control Pin Connections VOUT 1 X1 2 X2 3 AD0 4 AD1 5 AD2 6 AD3 7 AD4 8 AD5 9 AD6 10 AD7 11 VSS 12 24 VCC 23 SQW 22 CEOUT 21 CEIN 20 BC 19 INT 18 RST 17 DS 16 VSS 15 R/W 14 AS 13 CS 24-Pin DIP or SOIC PN428501.eps SLUS006A - MAY 1994 - REVISED MAY 2004 ® 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...
Unitrode
