DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs FEATURES PIN CONFIGURATIONS Integrated NV SRAM, Real-Time Clock (RTC), Crystal, Power-Fail Control TOP VIEW Circuit, and Lithium Energy Source A18 V 1 32 CC A16 Maxim 31 A15 2 Clock Registers are Accessed Identically to DS1747 A14 3 30 A17 the Static RAM. These Registers are A12 4 29 WE Resident in the Eight Top RAM Locations A13 A7 5 28 A6 6 27 A8 Century Byte Register (Y2K Compliant) A5 A9 7 26 A4 8 25 A11 Totally Nonvolatile with Over 10 Years of A3 OE 9 24 Operation in the Absence of Power A10 A2 10 23 A1 CE 11 22 BCD-Coded Century, Year, Month, Date, 12 21 DQ7 A0 Day, Hours, Minutes, and Seconds with 13 20 DQ6 DQ0 Automatic Leap Year Compensation Valid 14 19 DQ5 DQ1 Up to the Year 2100 DQ2 15 18 DQ4 Battery Voltage-Level Indicator Flag GND 16 17 DQ3 Power-Fail Write Protection Allows for Encapsulated DIP 10% V Power-Supply Tolerance CC (512k x 8) Lithium Energy Source is Electrically Disconnected to Retain Freshness Until N.C. 34 A18 1 Power is Applied for the First Time Maxim A15 33 A17 2 DS1747P A16 3 32 A14 DIP Module Only: 31 4 A13 RST 30 A12 V 5 CC Standard JEDEC Byte-Wide 512k x 8 Static 6 29 A11 WE 7 28 A10 RAM Pinout OE 27 8 A9 CE 26 9 A8 DQ7 PowerCap Module Board Only: 25 10 A7 DQ6 24 A6 11 DQ5 Surface-Mountable Package for Direct 23 A5 12 DQ4 22 13 A4 DQ3 Connection to PowerCap Containing 21 A3 14 DQ2 20 15 A2 Battery and Crystal DQ1 19 16 A1 DQ0 V X1 GND BAT X2 18 17 Replaceable Battery (PowerCap) A0 GND Power-On Reset Output PowerCap Module Board Pin-for-Pin Compatible with Other Densities (Uses DS9034PCX+ or DS9034I-PCX+ PowerCap) of DS174xP Timekeeping RAM Also Available in Industrial Temperature Range: -40C to +85C 1 of 16 19-5504 Rev 6/13 DS1747/DS1747P Y2K-Compliant, Nonvolatile Timekeeping RAMs PIN DESCRIPTION PIN NAME FUNCTION EDIP PowerCap 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 Input 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 Input/Output 18 12 DQ4 19 11 DQ5 20 10 DQ6 21 9 DQ7 16 17 GND Ground CE 22 8 Active-Low Chip-Enable Input 24 7 OE Active-Low Output-Enable Input 29 6 WE Active-Low Write-Enable Input 32 5 V Power-Supply Input CC 1 N.C. No Connection 4 RST Active-Low Power-On Reset Output (See Pin X1, X2 Crystal Input, Output Connections Configuration) (See Pin V Battery Connection BAT Configuration) 2 of 16