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


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Data Sheet
FULL DATA SHEET (PDF, 408kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Errata
  • Errata DS1501 15011511A7.pdf 
  • Errata DS1511 15011511A7.pdf 
  • Errata DS1501 15011511A6.pdf 
  • Errata DS1511 15011511A6.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.

    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 Time Format (hh = sec/100) Date Format Interface Supply Voltage (V) CL, Load Capacitance (pF) Memory Type Memory Size (Bytes) Number of Time of Day Alarms Features RoHS Available Package Operating Temp. Range (°C) Price**
    DS1501 
    •Watchdog Timekeeper
    		 HH:MM:SS YYYY-MM-DD Bytewide 3.3
    5     		12.5
    6     		NV SRAM 256 1
    •µP Reset
    •Kick-Start
    •Periodic Interrupt
    •Square-Wave Output
    •Wake-up
    		 Yes PDIP/28
    SOIC/28
    TSOP/28     		-40 to +85 $3.60 @ 1k
    DS1511   - 
    •µP Reset
    •Battery + Crystal
    •Kick-Start
    •Periodic Interrupt
    •Square-Wave Output
    •Wake-up
    		 MOD/28 0 to +70 $7.60 @ 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 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

    Evaluation Kits
    none

    Design Guides
  		• REAL-TIME CLOCKS (PDF)

    Reliability Reports
  		• Request Reliability Report for:

    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: 1-35 of 35

    DS1501 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1501W+  
    		PDIP;28 pin;
    Dwg: 56-G5000-002
    Use pkgcode/variation: P28+9*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501Y+  
    		PDIP;28 pin;
    Dwg: 56-G5000-002
    Use pkgcode/variation: P28+9*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YN+  
    		PDIP;28 pin;
    Dwg: 56-G5000-002
    Use pkgcode/variation: P28+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WN+  
    		PDIP;28 pin;
    Dwg: 56-G5000-002
    Use pkgcode/variation: P28+9*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WS+  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YS+T&R  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YS+  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YS  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WS  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28-1*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WS+T&R  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WSN  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WSN+  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WSN+T&R  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YSN+T&R  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YSN  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YSN+  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28+1*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WSN/T&R  
    		SOIC;28 pin;
    Dwg: 56-G2009-028
    Use pkgcode/variation: F28-1*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YE+  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YE+T&R  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WE  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WE+T&R  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WE/T&R  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WE+  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YE  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28-4*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WEN  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YEN  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501YEN+T&R  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501YEN+  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WEN/T&R  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1501WEN+  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1501WEN+T&R  
    		TSOP;28 pin;
    Dwg: 56-G5003-000
    Use pkgcode/variation: Z28+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1511 Free
    Sample    		 Buy
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1511W  
    		MOD;28 pin;
    Dwg: 56-G0001-001
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1511Y  
    		MOD;28 pin;
    Dwg: 56-G0001-001
    Use pkgcode/variation: MDP28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1511W+  
    		MOD;28 pin;
    Dwg: 56-G0001-001
    Use pkgcode/variation: MDP28+1*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1511Y+  
    		MOD;28 pin;
    Dwg: 56-G0001-001
    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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    2008-08-08
    This page last modified: 2008-08-08




             


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