DS14287 Datasheet | Real-Time Clock

FEATURES Direct Replacement for IBM AT puter Clock/Calendar Functionally patible with the DS1285/DS1287 Available as Chip (DS14285, DS14285S, or DS14285Q) or Stand-Alone Module with Embedded Lithium Battery and Crystal (DS14287) Automatic Backup Supply and Write .. Protection to Make External SRAM Nonvolatile Counts Seconds, Minutes, Hours, Days, Day of the Week, Date, Month, and Year with Leap Year pensation Valid Up to 2100 Binary or BCD Representation of Time, Calendar, and Alarm 12- or 24-Hour Clock with AM and PM in 12-Hour Mode Daylight Saving Time Option Multiplex Bus for Pin Efficiency Interfaced with Software as 128 RAM Locations 14 Bytes of Clock and Control Registers 114 Bytes of General Purpose RAM Programmable Square-Wave Output Signal Bus-patible Interrupt Signals (IRQ) Three Interrupts are Separately Software Maskable and Testable Time-of-Day Alarm Once/Second to Once/Day Periodic Rates from 122µs to 500ms End of Clock Update Cycle Optional Industrial Temperature Version Available: DS14285 DIP, SO, and PLCC PIN CONFIGURATIONS TOP VIEW VCCO 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 CEO CEI VBAT IRQ RESET DS GND R/W AS CS DIP/SO X2 X1 MOT VCCO VCC SQW CE0 AD0 AD1 AD2 AD3 AD4 AD5 N.C. 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 3 2 1 28 27 26 25 24 DS14285 DS14285 23 22 21 20 19 CEI VBAT IRQ RESET DS GND R/W AD6 N.C. AD7 GND CS AS N.C. PLCC VCCO N.C. N.C. AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 GND 24 1 23 2 3 DS14287 22 21 4 20 5 19 6 18 7 17 8 16 9 15 10 14 11 13 12 VCC SQW CEO CEI N.C. IRQ RESET DS N.C. R/W AS CS Encapsulated Package 1 of 26 REV: 112105 DS14285/DS14287 ORDERING INFORMATION PART DS14285 DS14285+ DS14285N DS14285N+ DS14285Q DS14285Q+ DS14285QN DS14285QN+ DS14285S DS14285S+ DS14285SN DS14285SN+ DS14285SN/T&R .. DS14285SN+T&R DS14285S/T&R DS14285S+T&R DS14287 DS14287+ TEMP RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C...