ENGLISH • 简体中文 • 日本語 • 한국어  

    Login | Register 


   
 
Enter keywords or part number    


What's New Products Solutions Design AppNotes Support Sales About Us Members

Maxim > Products > [Real-Time Clocks] 
DS1248, DS1248P
1024k NV SRAM with Phantom Clock


  QuickView     Technical Documents     Ordering Info     More Information     User Comments (0)     All  
Status
Part Number Status
DS1248 Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.
DS1248P Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 404kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The DS1248 1024k NV SRAM with Phantom Clock is a fully static nonvolatile RAM (organized as 128k words by 8 bits) with a built-in real-time clock. The DS1248 has a self-contained lithium energy source and control circuitry, which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and writes protection is unconditionally enabled to prevent garbled data in both the memory and real-time clock.

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

Key Features
  • Real-Time Clock (RTC) Keeps Track of Hundredths of Seconds, Minutes, Hours, Days, Date of the Month, Months, and Years
  • 128k x 8 NV SRAM Directly Replaces Volatile Static RAM or EEPROM
  • Embedded Lithium Energy Cell Maintains Calendar Operation and Retains RAM Data
  • Watch Function is Transparent to RAM Operation
  • Month and Year Determine the Number of Days in Each Month; Valid Up to 2100
  • Full 10% Operating Range
  • Operating Temperature Range: 0°C to +70°C
  • Over 10 Years of Data Retention in the Absence of Power
  • Lithium Energy Source is Electrically Disconnected to Retain Freshness Until Power is Applied for the First Time
  • DIP Module Only
  • Standard 32-Pin JEDEC Pinout
  • Available in Lead-Free Package
  • PowerCap Module Board Only
    • Surface Mountable Package for Direct Connection to PowerCap Containing Battery and Crystal
    • Replaceable Battery (PowerCap)
    • Pin-for-Pin Compatible with DS1244P and DS1251P
  • 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
DS1248  YY-MM-DD/ HH:MM:SS:hh
Bytewide
Phantom Clock
3.3
5
 NV SRAM 128K 0 $17.08 @1k
See All Timekeeping & Real-Time Clocks (80)

Diagram
DS1248, DS1248P: Pin Configuration
Pin Configuration

Application Notes
  		• Application Note 52: Using the Dallas Phantom Real-Time Clocks (RTCs) - DS1248P
  		• Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1248
  		• Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1248
  		• Application Note 507: PowerCap Package Allows for Density Upgrades, Surface Mount Assembly - DS1248
  		• Application Note 509: Using the SmartWatch/Phantom Clocks with a Microcontroller - DS1248

    Design Guides
  		• Real-Time Clocks (PDF)

    Reliability Reports
  		• Reliability Report: DS1248P.pdf
  		• Request Reliability Report for:
  		• Underwriters Laboratories (UL®) Recognized

    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: 1-8 of 8

    DS1248 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    DS1248Y-70     N/A No Longer Available EDIP;32 pin;707 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT32-2*
    		0°C to +70°C RoHS/Lead-Free: No
    Materials Analysis
    DS1248W-120+  
    		Active EDIP;32 pin;707 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT32+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1248Y-70+  
    		Active EDIP;32 pin;707 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT32+2*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1248W-120IND+    
    		Active EDIP;32 pin;707 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT32+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1248Y-70IND+    
    		Active EDIP;32 pin;707 mm²
    Outline Drawing: 21-0245 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: MDT32+2*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1248WP-120+  
    		Active PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC2+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1248YP-70+  
    		Active PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC2+3*
    		0°C to +70°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    DS1248WP-120IND+    
    		Active PCAP;34 pin;597 mm²
    Outline Drawing: 21-0246 (PDF)
    Land Pattern: Not Available
    Use pkgcode/variation: PC2+3*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    Related Products
    DS9034PCX PowerCap with Crystal

    More Like This: View Product Families for Similar Products

    Didn't Find What You Need?
  • Next Day Product Selection Assistance from Applications Engineers
  • Parametric Search
  • Applications Help

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

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

    		 Price and Availability 
     Samples 
     Buy Online 
     Package Information 
     Lead-Free Information 

    		 Related Products 
     Notes and Comments 
     Evaluation Kits 

    2005-07-08
    This page last modified: 2009-10-26


            •         •         •     Privacy Policy     •     Legal Notices

        Copyright © 2009 by Maxim Integrated Products