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DS1554

Dallas Semiconducotr
Part Number DS1554
Manufacturer Dallas Semiconducotr
Description 256K NV Y2KC Timekeeping RAM
Published Sep 21, 2005
Detailed Description 19-5497; Rev 9/10 www.maxim-ic.com DS1554 256k, Nonvolatile, Y2K-Compliant Timekeeping RAM FEATURES  Integrated NV S...
Datasheet PDF File DS1554 PDF File

DS1554
DS1554

Overview
19-5497; Rev 9/10 www.
maxim-ic.
com DS1554 256k, Nonvolatile, Y2K-Compliant Timekeeping RAM 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 LeapYear 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 TOP VIEW RST N.
C.
A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 DQ0 DQ1 DQ2 GND 1 32 2 Maxim 31 3 DS1554 30 4 29 5 28 6 27 7 26 8 25 9 24 10 23 11 22 12 21 13 20 14 19 15 18 16 17 VCC N.
C.
IRQ/FT WE A13 A8 A9 A11 OE A10 CE DQ7 DQ6 DQ5 DQ4 DQ3 Encapsulated DIP IRQ/FT N.
C.
N.
C.
RST VCC WE OE CE DQ7 DQ6 DQ5 DQ4 DQ3 DQ2 DQ1 DQ0 GND 1 34 2 Maxim 33 3 4 DS1554 32 31 5 30 6 29 7 28 8 27 9 26 10 25 11 24 12 23 13 22 14 21 15 20 16 19 17 X1 GND VBAT X2 18 N.
C.
N.
C.
A14 A13 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0 PowerCap Module Board (Uses DS9034PCX PowerCap) 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.
1 of 18 DS1554 256k, Nonvolatile, Y2K-Compliant Timekeeping RAM PIN DESCRIPTION A0–A14 - Address Inputs DQ0–DQ7 IRQ/FT RST - Data Input/Out...


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