DS1251Y-70+ Analog Devices

19-6079 Rev 11/11 DS1251/DS1251P 4096K NV SRAM with Phantom Clock FEATURES PIN CONFIGURATIONS Real-Time Clock Keeps Track of Hundredths TOP VIEW Of Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years 1 32 V A18/RST CC 512K x 8 NV SRAM Directly Replaces A16 31 A15 2 DS1251 Volatile Static RAM or EEPROM A14 3 30 A17 4 29 WE A12 Embedded Lithium Energy Cell Maintains A7 A13 5 28 Calendar Operation and Retains RAM Data A6 6 27 A8 Watch Function is Transparent to RAM A5 A9 7 26 A11 A4 8 25 Operation A3 OE 9 24 Automatic Leap Year Compensation Valid A2 10 23 A10 Up to 2100 A1 CE 11 22 Over 10 Years of Data Retention in the 12 21 DQ7 A0 Absence of Power 13 20 DQ6 DQ0 14 19 Full 10% Operating Range DQ1 DQ5 DQ2 15 18 DQ4 Lithium Energy Source is Electrically 17 GND 16 DQ3 Disconnected to Retain Freshness Until Power is Applied for the First Time Encapsulated Package DIP Module Only 740-Mil Flush Standard 32-Pin JEDEC Pinout Upward Compatible with the DS1248 PowerCap Module Board Only 34 A18 1 RST DS1251P 2 33 A17 Surface Mountable Package for Direct A15 32 A14 3 A16 Connection to PowerCap Containing 31 A13 4 N.C. 30 A12 V 5 CC Battery and Crystal 6 A11 29 WE 7 28 A10 OE Replaceable Battery (PowerCap) 27 A9 8 CE 26 A8 9 DQ7 Pin-for-Pin Compatible with Other 25 10 A7 DQ6 24 A6 11 Densities of DS124xP Phantom Clocks DQ5 23 A5 DQ4 12 22 A4 Underwriters Laboratories (UL) Recognized 13 DQ3 14 21 A3 DQ2 (www.maxim-ic.com/qa/info/ul/) 15 20 A2 DQ1 X1 GND V X2 BAT 19 A1 16 DQ0 17 18 A0 GND PowerCap Module Board (Uses DS9034PCX+ PowerCap) 1 of 20 DS1251/DS1251P ORDERING INFORMATION VOLTAGE PART TEMP RANGE PIN-PACKAGE RANGE (V) DS1251W-120+ 0C to +70C 3.3 32 EDIP (0.740a) DS1251W-120IND+ -40C to +85C 3.3 32 EDIP (0.740a) DS1251WP-120+ 0C to +70C 3.3 34 PowerCap* DS1251WP-120IND+ -40C to +85C 3.3 34 PowerCap* DS1251Y-70+ 0C to +70C 5.0 32 EDIP (0.740a) DS1251YP-70+ 0C to +70C 5.0 34 PowerCap* DS1251YP-70IND+ -40C to +85C 5.0 34 PowerCap* + Denotes a lead(Pb)-free/RoHS-compliant package. *DS9034PCX+ or DS9034I-PCX+ (PowerCap) required. Must be ordered separately. PIN DESCRIPTION PIN NAME FUNCTION EDIP PowerCap 1 1 RST Active-Low Reset Input. This pin has an internal pullup resistor connected to V . CC 1 34 A18 2 3 A16 3 32 A14 4 30 A12 5 25 A7 6 24 A6 7 23 A5 8 22 A4 9 21 A3 10 20 A2 Address Inputs 11 19 A1 12 18 A0 23 28 A10 25 29 A11 26 27 A9 27 26 A8 28 31 A13 30 33 A17 31 2 A15 13 16 DQ0 14 15 DQ1 15 14 DQ2 17 13 DQ3 Data In/Data Out 18 12 DQ4 19 11 DQ5 20 10 DQ6 21 9 DQ7 2 of 20