Keithley DS1244-DS1244P free download

File name DS1244-DS1244P.pdf

19-6077; Rev 11/11 www.maxim-ic.com DS1244/DS1244P 256K NV SRAM with Phantom Clock FEATURES PIN CONFIGURATIONS Real-Time Clock (RTC) Keeps Track of TOP VIEW Hundredths of Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years A14/RST 1 28 VCC 32K x 8 NV SRAM Directly Replaces 2 DS1244 27 WE A12 Volatile Static RAM or EEPROM A7 3 26 A13 A6 4 25 A8 Embedded Lithium Energy Cell Maintains 5 24 A9 A5 Calendar Operation and Retains RAM Data A4 6 23 A11 Watch Function is Transparent to RAM A3 7 22 OE 8 21 A10 Operation A2 A1 9 20 CE Automatic Leap Year Compensation Valid A0 10 19 DQ7 Up to 2100 DQ0 11 18 DQ6 Full 10% Operating Range DQ1 12 17 DQ5 Over 10 Years of Data Retention in the DQ2 13 16 DQ4 14 15 Absence of Power GND DQ3 Lithium Energy Source is Electrically EDIP Module Disconnected to Retain Freshness Until (740 mils) Power is Applied for the First Time DIP Module Only RST 1 DS1244P 34 N.C. N.C. N.C. 2 33 Standard 28-Pin JEDEC Pinout N.C. 3 32 A14 4 31 A13