View ds1682 datasheet:

DS1682 Total Elapsed Time Recorder with Alarm www.maxim-ic.com FEATURES PIN ASSIGNMENT Records the total time that the event input has EVENT 1 8 VCC been active and the number of events that N/C 7 N/C 2 have occurred DS1682 ALARM 3 6 SDA 32-bit, nonvolatile, elapsed time counter GND 4 5 SCL monitors event duration with quarter-second resolution and provides 34 years of total time Top View DS1682S 8-Pin SO (150mil) accumulation Programmable elapsed time ALARM output Package dimension information can be found at: Nonvolatile 17-bit event counter records the http://dbserv.maxim-ic.com/products.cfm total number of times an event has occurred Calibrated, temperature-compensated RC PIN DESCRIPTION time base accurate to 2% typical