Maxim > Products > Real-Time Clocks (RTCs) > DS1248, DS1248P

DS1248, DS1248P

1024K NV SRAM with Phantom Clock

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
DS1248	Active: In Production. See Ordering Information for details.
DS1248P	Active: In Production.

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 V_CC 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.

Data Sheet

Download	Rev 4	(PDF, 625.6kB)
E-Mail

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
Automatic Leap Year Compensation Valid Up to 2100
Full 10% Operating Range
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
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

V_SUPPLY
(V)

Memory Type

Memory Size
(Bytes)

Time of Day Alarms

Integrated XTAL

Budgetary Price

hh = sec/100

See Notes

DS1248

YY-MM-DD/ HH:MM:SS:hh

Bytewide

Phantom Clock

3.3

NV SRAM

128K

$17.08 @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

Pin Configuration

Application Notes

Application Note 52		Using the Dallas Phantom 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 507		PowerCap Package Allows for Density Upgrades, Surface Mount Assembly
Application Note 509		Using the SmartWatch/Phantom Clocks with a Microcontroller

Product Guides

Real-Time Clocks (PDF)

Reliability Reports

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

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1248W-120+			Active		EDIP;32 pin;707.2 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;707.2 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;596.9 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;596.9 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
DS1248Y-70		N/A	No Longer Available	DS128Y-70+	EDIP;32 pin;707.2 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
DS1248Y-70+			Active		EDIP;32 pin;707.2 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-70IND+			Active		EDIP;32 pin;707.2 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
DS1248YP-70+			Active		PCAP;34 pin;596.9 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

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

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-6078 Rev 4; 2012-01-03
This page last modified: 2012-01-03