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Data Sheet

FULL DATA SHEET (PDF, 404kB) Download   E-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.

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

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

Evaluation Kits

none

Design Guides

Real-Time Clocks (PDF)

Reliability Reports

Reliability Report: DS1248P.pdf Request Reliability Report for: DS1248 Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * 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	Notes	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1248Y-70	5V, 70ns			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+				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+				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+				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+				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+				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+				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+				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

More Information

Real-Time Clock Design Guide

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