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Maxim > Products > Real-Time Clocks 
DS1553, DS1553P
64kB, Nonvolatile, Year-2000-Compliant Timekeeping RAM


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Data Sheet
FULL DATA SHEET (PDF, 484kB)
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Description
The DS1553 is a full-function, year-2000-compliant (Y2KC) real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and "8k x 8 nonvolatile static RAM (NV SRAM)." User access to all registers within the DS1553 is accomplished with a bytewide interface as shown in Figure 1. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour BCD format. Corrections for day of month and leap year are made automatically.

Key Features
  • Integrated NV SRAM, RTC, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
  • Clock Registers are Accessed Identically to the Static RAM; These Registers are Resident in the 16 Top RAM Locations
  • 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

Key Specifications:   Timekeeping & Real-Time Clocks
Part Number Functions Time Format (hh = sec/100) Date Format Interface Supply Voltage (V) Memory Type Memory Size (Bytes) Number of Time of Day Alarms Features RoHS Available Package Smallest Available Package (max w/pins) (mm2) Operating Temp. Range (°C) Price**
DS1553 
•Watchdog Timekeeper
 HH:MM:SS YYYY-MM-DD Bytewide 3.3
5 		NV SRAM 8k 1
•µP Reset
•Battery + Crystal
•Periodic Interrupt
•PowerCap Package
 Yes MOD/28
PWRCP/34 		607 0 to +70 $10.01 @ 1k
See All Timekeeping & Real-Time Clocks (86)
Notes:
**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Application Notes
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1553
  		• Application Note 507: PowerCap Package Allows for Density Upgrades, Surface Mount Assembly - DS1553, DS1553
  		• Application Note 520: Using a Watchdog Timekeeping RAM with a Microcontroller - DS1553

    Evaluation Kits
    none

    Design Guides
  		• REAL-TIME CLOCKS (PDF)

    Reliability Reports
  		• Reliability Report: DS1553.pdf DS1553P.pdf

    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-12 of 12

    DS1553 Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1553-85+  
    		MOD;28 pin;630 mm²
    Dwg: 56-G0002-001A (PDF)
    Use pkgcode/variation: MDF28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1553-100   5V, 100ns
    		MOD;28 pin;737 mm²
    Dwg: 56-G0001-001A (PDF)
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1553W-120   3.3V, 120ns
    		MOD;28 pin;737 mm²
    Dwg: 56-G0001-001A (PDF)
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1553W-150   3.3V, 150ns
    		MOD;28 pin;737 mm²
    Dwg: 56-G0001-001A (PDF)
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1553W-120+  
    		MOD;28 pin;737 mm²
    Dwg: 56-G0001-001A (PDF)
    Use pkgcode/variation: MDP28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1553-100+  
    		MOD;28 pin;737 mm²
    Dwg: 56-G0001-001A (PDF)
    Use pkgcode/variation: MDP28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1553WP-120+  
    		PWRCP;34 pin;607 mm²
    Dwg: 56-G0003-001A1 (PDF)
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1553WP-150   3.3V, 150ns
    		PWRCP;34 pin;607 mm²
    Dwg: 56-G0003-001A1 (PDF)
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1553WP-120   3.3V, 120ns
    		PWRCP;34 pin;607 mm²
    Dwg: 56-G0003-001A1 (PDF)
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1553P Notes Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1553P-85+  
    		PWRCP;34 pin;607 mm²
    Dwg: 56-G0003-001A1 (PDF)
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1553P-100+  
    		PWRCP;34 pin;607 mm²
    Dwg: 56-G0003-001A1 (PDF)
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1553P-100   5V, 100ns
    		PWRCP;34 pin;607 mm²
    Dwg: 56-G0003-001A1 (PDF)
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis

    More Information
  		• Real-Time Clock Design Guide (PDF)
  		• Other Watchdog Clocks

    Related Products
    DS9034PCX PowerCap with Crystal

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    2005-07-14
    This page last modified: 2007-06-18




             


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