Maxim > Products > Real-Time Clocks (RTCs) > DS1501, DS1511

DS1501, DS1511

Y2K-Compliant Watchdog Real-Time Clocks
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Status Explanations for product status codes

Part Number Status
DS1501 Active: In Production. See Ordering Information for details.
DS1511 Active: In Production. See Ordering Information for details.

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.
 

Data Sheet

Download this datasheet in PDF formatDownload Rev 5 (PDF, 448kB)
Send this datasheet to any email addressE-Mail

Errata DS1501 1501A7.pdf
Errata DS1511 1501A7.pdf
Errata DS1501 1501A6.pdf
Errata DS1511 1501A6.pdf
This product contains lithium-metal batteries. See applicable regulations for transport requirements for batteries in equipment.

Key Features

  • 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
  

Applications/Uses

  • 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 Integrated XTAL Budgetary 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 No $3.60 @1k
DS1511  - $7.60 @1k
See All Timekeeping & Real-Time Clocks (86)
Pricing 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.


Diagram

DS1501, DS1511: Typical Operating Circuit
Typical Operating Circuit

Application Notes

Application Note 58   Crystal Considerations with Maxim Real-Time Clocks (RTCs)
Application Note 504   Design Considerations for Maxim Real-Time Clocks
Application Note 505   Lithium Coin-Cell Batteries: Predicting an Application Lifetime
Application Note 508   Using the Power-Control Functions of the DS1501/DS1511 Real-Time Clock
Application Note 701   Using the DS32kHz with Dallas Real-Time Clocks
Application Note 3816   Selecting a Backup Source for Real-Time Clocks
Application Note 4247   Oscillator Design Considerations for Low-Current Applications
Application Note 5013   Lithium Battery Content in Maxim Products

Product Guides

Real-Time Clocks (PDF)

Reliability Reports

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

Software/Models

DS1501WE IBIS Model
DS1501YE IBIS Model

Ordering Information

Filters: Part Number: Package: Temperature: Tape and Reel Sample
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1501W+  
Active   PDIP(W);28 pin;592.6 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
DS1501WE     N/A No Longer Available DS1501WE+

 		 TSOP;28 pin;109.8 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;109.8 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;109.8 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     N/A No Longer Available DS1501WE+T&R

 		 TSOP;28 pin;109.8 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/C02     N/A No Longer Available DS1501WE+

 		 TSOP;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1501WEN     N/A No Longer Available DS1501WEN+

 		 TSOP;28 pin;109.8 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;109.8 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;109.8 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     N/A No Longer Available DS1501WEN+T&R

 		 TSOP;28 pin;109.8 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
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1501WN+    
Active   PDIP(W);28 pin;592.6 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
DS1501WS     N/A No Longer Available   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+     N/A No Longer Available   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     N/A No Longer Available   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     N/A No Longer Available   SOIC;

Land Pattern: Not Available

0°C to +70°C See data sheet
DS1501WSN     N/A No Longer Available   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+     N/A No Longer Available   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     N/A No Longer Available   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-W     N/A No Longer Available DS1685SN-5+

 		 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+W     N/A No Longer Available DS1685S-5+

 		 N.SO;

Land Pattern: Not Available

-40°C to +85°C See data sheet
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1501WSN/T&R     N/A No Longer Available   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
DS1501WZ+    
Active   SOIC(W);28 pin;192.8 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;192.8 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
DS1501WZN+    
Active   SOIC(W);28 pin;192.8 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+T&R    
Active   SOIC(W);28 pin;192.8 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
DS1501Y+  
Active   PDIP(W);28 pin;592.6 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
DS1501YE     N/A No Longer Available DS1501YE+

 		 TSOP;28 pin;109.8 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;109.8 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;109.8 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
DS1501YEN     N/A No Longer Available DS1501YEN+

 		 TSOP;28 pin;109.8 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
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1501YEN+    
Active   TSOP;28 pin;109.8 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;109.8 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
DS1501YN+    
Active   PDIP(W);28 pin;592.6 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
DS1501YS     N/A No Longer Available   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+     N/A No Longer Available   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+T&R     N/A No Longer Available   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
DS1501YSN     N/A No Longer Available   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+     N/A No Longer Available   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+T&R

 		 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
DS1501YZ+    
Active   SOIC(W);28 pin;192.8 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
Part Number Free
Sample		 Buy Status Explanations for product status codes Recommended Replacement Package:
TYPE PINS FOOTPRINT
DRAWING  CODE/VAR * 		Temp RoHS/Lead-Free?
Materials Analysis
DS1501YZ+T&R    
Active   SOIC(W);28 pin;192.8 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
DS1501YZN+    
Active   SOIC(W);28 pin;192.8 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;192.8 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
DS1511W     N/A No Longer Available DS1511W+

 		 EDIP;28 pin;625.9 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;625.9 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     N/A No Longer Available DS1511Y+

 		 EDIP;28 pin;625.9 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;625.9 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

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

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Description
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Applications/Uses
Key Specifications
Diagram
Notes and Comments
  Data Sheet
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Rev 5; 2009-01-19
This page last modified: 2009-10-23

 


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