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Maxim > Products > [Real-Time Clocks] 
DS1743, DS1743P
Y2K-Compliant, Nonvolatile Timekeeping RAMs


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Status
Part Number Status
DS1743 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.
DS1743P Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet
FULL DATA SHEET (PDF, 196kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1743 is a full-function, year-2000-compliant (Y2KC), real-time clock/calendar (RTC) and 8k x 8 nonvolatile static RAM. User access to all registers within the DS1743 is accomplished with a bytewide interface as shown in Figure 1 in the full data sheet. The RTC information and control bits reside in the eight uppermost RAM locations. The RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in 24-hour binary-coded decimal (BCD) format. Corrections for the day of the month and leap year are made automatically. The RTC clock registers are double buffered to avoid access of incorrect data that can occur during clock update cycles. The double-buffered system also prevents time loss as the timekeeping countdown continues unabated by access to time register data. The DS1743 also contains its own power-fail circuitry, which deselects the device when the VCC supply is in an out-of-tolerance condition. When VCC is above VPF, the device is fully accessible. When VCC is below VPF, the internal active-low CE signal is forced high, preventing any access. When VCC rises above VPF, access remains inhibited for TREC, allowing time for the system to stabilize. These features prevent loss of data from unpredictable system operation brought on by low VCC as errant access and update cycles are avoided.

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

Key Features
  • Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit, and Lithium Energy Source
  • Clock Registers are Accessed Identically to the Static RAM. These Registers Reside in the Eight Top RAM Locations.
  • Century Byte Register
  • Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power
  • BCD-Coded Century, Year, Month, Date, Day, Hours, Minutes, and Seconds with Automatic Leap Year Compensation Valid through 2099
  • Low-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
  • DIP Module Only
    • Standard JEDEC Bytewide 8k x 8 Static RAM Pinout
  • PowerCap Module Board Only
    • Surface-Mountable Package for Direct Connection to PowerCap Containing Battery and Crystal
    • Replaceable Battery (PowerCap)
    • Power-On Reset Output
    • Pin-for-Pin Compatible with Other Densities of DS174XP Timekeeping RAM
  • Underwriters Laboratories (UL®) Recognized

Key Specifications:  Timekeeping & Real-Time Clocks
Part Number Date/ Time Format Interface VSUPPLY
(V)		 Memory Type Memory Size
(Bytes)		 Time of Day Alarms Price
hh = sec/100 See Notes
DS1743  YYYY-MM-DD/ HH:MM:SS Bytewide
3.3
5
 NV SRAM 8K 0 $8.78 @1k
See All Timekeeping & Real-Time Clocks (80)

Diagram
DS1743, DS1743P: Block Diagram
Block Diagram

Application Notes
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1743
  		• Application Note 507: PowerCap Package Allows for Density Upgrades, Surface Mount Assembly - DS1743, DS1743
  		• Application Note 519: Using a Nonvolatile Timekeeping RAM with a Microcontroller - DS1743

    Design Guides
  		• Real-Time Clocks (PDF)

    Reliability Reports
  		• Reliability Report: DS1743.pdf DS1743P.pdf
  		• Underwriters Laboratories (UL®) Recognized

    Software/Models
  		• DS1743WP120 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: 1-27 of 27

    DS1743 Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1743-85+  
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743-70     N/A No Longer Available DS1743-85+

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    DS1743-85IND+    
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743-100 IND     N/A No Longer Available DS1743-100IND+
    		 EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743W-120 IND     N/A No Longer Available DS1743W-120IND+
    		 EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743-100     N/A No Longer Available
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743W-120     N/A No Longer Available DS1743W-120+
    		 EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743W-150     N/A No Longer Available DS1743W-120+
    		 EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743-100+  
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743W-120+  
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743W-120IND+    
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743W-150+  
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743-100IND+    
    		Active
    		EDIP;28 pin;630 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDF28+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743WP-150     N/A No Longer Available DS1743WP-120+
    		 PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743WP-120IND+    
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743WP-120IND     N/A No Longer Available DS1743WP-120IND+
    		 PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1-2*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743WP-120    
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743WP-120+  
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743WP-150+  
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743P Free
    Sample    		 Buy Status Recommended Replacement
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1743P-C01+    
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743P-85+  
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743P-100     N/A No Longer Available DS1743P-85+
    		 PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743P-100IND     N/A No Longer Available DS1743P-85IND+
    		 PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1743P-70     N/A No Longer Available DS1743P-85+

    Land Pattern: Not Available

    		0°C to +70°C See data sheet
    DS1743P-85IND+    
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743P-100IND+    
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1743P-100+  
    		Active
    		PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC1+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Related Products
    DS9034PCX PowerCap with Crystal

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    2007-09-10
    This page last modified: 2009-09-24


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