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Maxim > Products > [Real-Time Clocks] 
DS1501, DS1511
Y2K-Compliant Watchdog Real-Time Clocks


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Status
Part Number Status
DS1501 Active: In Production. But some versions of the family are Not Recommended for New Designs. See Ordering Information.
DS1511 Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 448kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Errata
  • Errata DS1501 1501A7.pdf 
  • Errata DS1511 1501A7.pdf 
  • Errata DS1501 1501A6.pdf 
  • Errata DS1511 1501A6.pdf 

    • Description
    The DS1501/DS1511 are full-function, year 2000-compliant real-time clock/calendars (RTCs) with an RTC alarm, watchdog timer, power-on reset, battery monitors, 256 bytes NV SRAM, and a 32.768kHz output. User access to all registers within the DS1501/DS1511 is accomplished with a byte-wide interface, as shown in Figure 8. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format. Corrections for day of month and leap year are made automatically.

    This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

    Key Features   Applications/Uses
    • BCD-Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap-Year Compensation Valid Up to the Year 2100
    • Programmable Watchdog Timer and RTC Alarm
    • Century Register; Y2K-Compliant RTC
    • +3.3 (W) or +5V (Y) Operation
    • Precision Power-On Reset
    • Power-Control Circuitry Support System Power-On from Date/Day/Time Alarm or Key Closure/Modem-Detect Signal
    • 256 Bytes Battery-Backed SRAM
    • Auxiliary Battery Input
    • Accuracy of DS1511 Better than ±1 Minute/Month at +25°C
    • Day-of-Week/Date Alarm Register
    • Crystal Select Bit Allow RTC to Operate with 6pF or 12.6pF Crystal (DS1501)
    • Battery Voltage-Level Indicator Flags
    • Available as Chip (DS1501) or Stand-Alone Encapsulated DIP Module with Embedded Battery and Crystal (DS1511)
    • Underwriters Laboratories (UL®) Recognized

    		  
  		• Battery-Backed Systems
  		• Consumer Electronics
  		• Office Equipment
  		• Remote Systems
  		• Telecom Switches

    Key Specifications:  Timekeeping & Real-Time Clocks
    Part Number Functions Date/ Time Format Interface VSUPPLY
    (V)    		 CL
    (pF)    		 Memory Type Memory Size
    (Bytes)    		 Time of Day Alarms Price
    hh = sec/100 See Notes
    DS1501  Watchdog Timekeeper YYYY-MM-DD/ HH:MM:SS Bytewide
    3.3
    5
    6
    12.5
    		 NV SRAM 256 1 $3.60 @1k
    DS1511  - $7.60 @1k
    See All Timekeeping & Real-Time Clocks (80)

    Diagram
    DS1501, DS1511: Typical Operating Circuit
    Typical Operating Circuit

    Application Notes
  		• Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1501
  		• Application Note 66: Watchdog Timekeeper - DS1501, DS1511
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1501, DS1511
  		• Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1501
  		• Application Note 508: Using the Power-Control Functions of the DS1501/DS1511 Real-Time Clock - DS1501, DS1511
  		• Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1501
  		• Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1501

    Design Guides
  		• Real-Time Clocks (PDF)

    Reliability Reports
  		• Reliability Report: DS1501.pdf
  		• Request Reliability Report for:
  		• Underwriters Laboratories (UL®) Recognized

    Software/Models
  		• DS1501YE IBIS Model
  		• DS1501WE IBIS Model

    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: 1-46 of 46

    DS1501 Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1501W+  
    		Active
    		PDIP(W);28 pin;593 mm²
    Outline Drawing: 21-0044 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P28+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501Y+  
    		Active
    		PDIP(W);28 pin;593 mm²
    Outline Drawing: 21-0044 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P28+5*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WN+    
    		Active
    		PDIP(W);28 pin;593 mm²
    Outline Drawing: 21-0044 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P28+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YN+    
    		Active
    		PDIP(W);28 pin;593 mm²
    Outline Drawing: 21-0044 (PDF)
    Land Pattern: Not Applicable
    Use pkgcode/variation: P28+5*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YZ+    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WZ+    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WZ+T&R    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YZ+T&R    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WS/T&R     N/A No Longer Available DS1501WZ+

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    DS1501YS     N/A No Longer Available DS1501YZ+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YS+T&R     N/A No Longer Available DS1501YZ+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WZN+T&R    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YZN+    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WZN+    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YZN+T&R    
    		Active
    		SOIC(W);28 pin;193 mm²
    Outline Drawing: 21-0042 (PDF)
    Land Pattern: 90-0109 (PDF)
    Use pkgcode/variation: W28+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WSN+T&R-W    
    		Active
    		SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YSN+T&R     N/A No Longer Available DS1501YZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WS  
    		NRND DS1501WZ+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WS+  
    		NRND DS1501WZ+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WS+T&R    
    		NRND DS1501WZ+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YS+  
    		NRND DS1501YZ+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WSN    
    		NRND DS1501WZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WSN/T&R    
    		NRND DS1501WZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YSN    
    		NRND DS1501YZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WSN+    
    		NRND DS1501WZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WSN+T&R    
    		NRND DS1501WZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YSN+    
    		NRND DS1501YZN+
    		 SOIC(W);28 pin;235 mm²
    Outline Drawing: 21-0251 (PDF)
    Land Pattern: 90-0255 (PDF)
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WE/T&R/C02     N/A No Longer Available DS1501WE+

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    DS1501WE    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WE/T&R    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YE  
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WE+  
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WE+T&R    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YE+  
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YE+T&R    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WEN    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YEN    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WEN/T&R    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WEN+    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WEN+T&R    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YEN+    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YEN+T&R    
    		Active
    		TSOP;28 pin;110 mm²
    Outline Drawing: 21-0273 (PDF)
    Land Pattern: 90-0319 (PDF)
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1511 Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1511W  
    		Active
    		EDIP;28 pin;626 mm²
    Outline Drawing: 21-0241 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1511Y  
    		Active
    		EDIP;28 pin;626 mm²
    Outline Drawing: 21-0241 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1511W+  
    		Active
    		EDIP;28 pin;626 mm²
    Outline Drawing: 21-0241 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDP28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1511Y+  
    		Active
    		EDIP;28 pin;626 mm²
    Outline Drawing: 21-0241 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDP28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Other Watchdog Clocks
  		• RTC Calculator

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    •  QuickView   Technical Documents   Ordering Info   More Information  
     Description 
     Key Features 
     Applications/Uses 
     Key Specifications 
     Diagram 

    		 Data Sheet 
     Errata 
     Application Notes 
     Design Guides 
     Engineering Journals 
     Reliability Reports 
     Software/Models 
     Evaluation Kits 

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    2009-01-19
    This page last modified: 2009-10-23


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