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| DS1285/DS1285Q DS1285/DS1285Q Real Time Clock FEATURES PIN ASSIGNMENT MOT X1 X2 AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 GND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VCC SQW NC RCLR VBAT IRQ RESET DS GND R/W AS CS * Drop-in replacement for IBM AT computer clock/calendar * Pin configuration closely matches MC146818A * Counts seconds, minutes, hours, day of the week, date, month, and year with leap year compensation alarm * Binary or BCD representation of time, calendar, and * 12- or 24-hour clock with AM and PM in 12-hour mode * Daylight Savings Time option * Selectable between Motorola and Intel bus timing * Multiplex bus for pin efficiency * Interfaced with software as 64 RAM locations - 14 bytes of clock and control registers - 50 bytes of general purpose RAM DS1285 24-PIN DIP VCC SQW MOT NC NC X2 4 AD0 AD1 AD2 AD3 AD4 AD5 NC 5 6 7 8 9 10 X1 32 1 28 27 26 25 24 23 22 21 20 RCLR VBAT IRQ RESET DS GND R/W * Programmable square wave output signal * Bus compatible interrupt signals (IRQ) * Three interrupts are separately software-maskable and testable - Time-of-day alarm once/second to once/day - Periodic rates from 122 s to 500 ms - End of clock update cycle 19 11 12 13 14 15 16 17 18 AD6 AD7 GND NC NC CS AS DS1285Q 28-PIN PLCC * Optional 28-pin PLCC surface mount package DESCRIPTION The DS1285 Real Time Chip is a direct replacement for the MC146818A in IBM AT computer clock/calendar and other applications. For a complete description of operating conditions, electrical and mechanical characteristics, bus timing, and pin descriptions see the DS12885 data sheet. PIN DESCRIPTION AD0-AD7 NC MOT CS AS R/W DS RESET IRQ SQW VCC GND X1,X2 VBAT RCLR - - - - - - - - - - - - - - - Multiplexed Address/Data Bus No Connection Bus Type Selection Chip Select Address Strobe Read/Write Input Data Strobe Reset Input Interrupt Request Output (open drain) Square Wave Output +5 Volt Supply Ground 32.768 KHz Crystal Connections +3 Volt Battery Input RAM Clear 050898 1/1 |
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