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DS1556W-120+ Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1556W-120+ Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 18 page 1 of 18 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata. FEATURES Integrated NV SRAM, Real-Time Clock (RTC), Crystal, Power-Fail Control Circuit, and Lithium Energy Source Clock Registers are Accessed Identically to the Static RAM; These Registers Reside in the 16 Top RAM Locations Century Byte Register (i.e., Y2K Compliant) Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power Precision Power-On Reset Programmable Watchdog Timer and RTC Alarm BCD-Coded Year, Month, Date, Day, Hours, Minutes, and seconds with Automatic Leap- Year Compensation Valid Up to the Year 2100 Battery Voltage-Level Indicator Flag Power-Fail Write Protection Allows for 10% VCC Power-Supply Tolerance Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time Also Available in Industrial Temperature Range: -40°C to +85°C PIN CONFIGURATIONS DS1556 1M, Nonvolatile, Y2K-Compliant Timekeeping RAM www.maxim-ic.com RST VCC A15 IRQ/FT WE A13 A8 A9 A11 OE A10 CE DQ7 DQ5 DQ6 DQ4 DQ3 13 1 2 3 4 5 6 7 8 9 10 11 12 14 31 A14 A7 A5 A4 A3 A2 A1 A0 DQ1 DQ0 32 30 29 28 27 26 25 24 23 22 21 19 20 A16 A12 A6 DQ2 GND 15 16 18 17 Encapsulated DIP Maxim DS1556 TOP VIEW IRQ/FT 1 2 3 A15 A16 RST VCC OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 4 5 6 7 8 9 10 11 12 13 14 15 16 17 N.C. A14 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 34 N.C. X1 GND VBAT X2 PowerCap Module Board (Uses DS9034PCX PowerCap) WE Maxim DS1556 19-5500; Rev 9/10 |
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