DS1244Y-70+

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 V 1 28 CC A14/RST DS1244 27 32K x 8 NV SRAM Directly Replaces 2 WE A12 3 26 A13 A7 Volatile Static RAM or EEPROM 4 25 A8 A6 Embedded Lithium Energy Cell Maintains 5 24 A9 A5 Calendar Operation and Retains RAM Data 6 23 A11 A4 7 22 OE Watch Function is Transparent to RAM A3 8 21 A10 A2 Operation 9 20 CE A1 Automatic Leap Year Compensation Valid 10 19 DQ7 A0 Up to 2100 11 18 DQ6 DQ0 12 17 DQ5 DQ1 Full 10% Operating Range 13 16 DQ4 DQ2 Over 10 Years of Data Retention in the 14 15 DQ3 GND Absence of Power EDIP Module Lithium Energy Source is Electrically (740 mils) Disconnected to Retain Freshness Until Power is Applied for the First Time 34 N.C. 1 DIP Module Only RST DS1244P 2 33 N.C. N.C. Standard 28-Pin JEDEC Pinout 32 A14 3 N.C. 31 A13 4 N.C. PowerCap Module Board Only 30 A12 V 5 CC 6 29 A11 WE Surface Mountable Package for Direct 7 28 A10 OE 27 A9 8 CE Connection to PowerCap Containing 26 A8 9 DQ7 25 10 A7 DQ6 Battery and Crystal 24 A6 11 DQ5 23 A5 Replaceable Battery (PowerCap) DQ4 12 22 A4 13 DQ3 Pin-for-Pin Compatible with DS1248P 21 14 A3 DQ2 20 A2 15 DQ1 X1 GND V X2 BAT and DS1251P 19 A1 16 DQ0 17 18 A0 GND Underwriters Laboratories (UL) Recognized PowerCap Module (Uses DS9034PCX+ PowerCap) 1 of 20 DS1244/DS1244P TYPICAL OPERATING CIRCUIT ORDERING INFORMATION VOLTAGE PART TEMP RANGE PIN-PACKAGE (V) DS1244W-120+ 0C to +70C 28 EDIP (0.740a) 3.3 DS1244W-120IND+ -40C to +85C 28 EDIP (0.740a) 3.3 DS1244WP-120+ 0C to +70C 34 PowerCap* 3.3 DS1244WP-120IND+ -40C to +85C 34 PowerCap* 3.3 DS1244Y-70+ 0C to +70C 28 EDIP (0.740a) 5.0 DS1244YP-70+ 0C to +70C 34 PowerCap* 5.0 +Denotes a lead(Pb)-free/RoHS-compliant device. *DS9034PCX+ or DS9034I-PCX+ (PowerCap) required. (Must be ordered separately.) 2 of 20