DS1283 Datasheet (data sheet) PDF





DS1283 Datasheet, Watchdog Timekeeper Chip

DS1283   DS1283  

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DS1283 DS1283 Watchdog Timekeeper Chip FEATURES PIN ASSIGNMENT INTA X1 X2 NC A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 2 5 24 23 22 21 20 19 18 17 16 15 V CC WE INTB(INTB) V BAT • Keeps track of h undredths of seconds, seconds, minutes, hours, days, date of the month, months , and years; valid leap year compersati on up to 2100 • Watchdog timer resta rts an out–of–control processor • Alarm function provides notice of real time related occurrences RCLR SQW OE INTP CE DQ7 DQ6 DQ5 DQ4 DQ3 • Design ed for battery operation www.DataSheet4 U.com • Programmable interrupts and s quare wave outputs maintain 28–pin JEDE

DS1283 Datasheet, Watchdog Timekeeper Chip

DS1283   DS1283  
C footprint dress and data bus • All registers are individually addressable via the ad• Accuracy is better than 2 minutes/month at 25°C • 50 bytes of user nonvolatile RAM • Optional 28 –pin SOIC surface mount package • L ow–power CMOS circuitry is maintained on less than 1 µA in standby mode DS 1283 28–PIN DIP (600 MIL) INTA X1 X2 NC A5 1 2 3 28 27 26 25 24 23 22 21 20 19 18 17 16 15 V CC WE INTB(INTB) VBA T RCLR SQW OE INTP CE DQ7 DQ6 DQ5 DQ4 D Q3 • Optional industrial temperature range –40°C to +85°C DESCRIPTION T he DS1283 Watchdog Timekeeper Chip is a self–contained real time clock, alar m, watchdog timer, and interval timer i n a 28–pin JEDEC DIP or 28–pin SOIC surface mount package. The DS1283 is s pecifically designed to maintain intern al operations from a single low voltage supply. In fact, the only two external components required by the DS1283 are a battery and crystal. For a complete d escription of operating conditions, ele ctrical characteristics, bus timing, an d pin descriptions other than X1, X2, V BAT, VCC, RCLR, INTB, and INTP see the DS1286 Watchdog Timekeeper data sheet. 4 5 6 7 8 9 10 11 12 13 14 A4 A3 A2 A 1 A0 DQ0 DQ1 DQ2 GND DS1283S 28–PIN SOIC (330 MIL) NOTE: Pin 4 must be lef t disconnected. ECopyright 1997 by Dallas Semiconductor Corporation. All Rights Res








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