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Status
Part Number	Status
DS1971	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 264kB) Download   E-Mail

Description

The DS1971 256-bit EEPROM iButton is a rugged read/write data carrier that identifies and stores relevant information about the product or person to which it is attached. This information can be accessed with minimal hardware: for example, a single port pin of a microcontroller. The DS1971 consists of a factory-lasered registration number that includes a unique 48-bit serial number, an 8-bit CRC, and an 8-bit Family Code (14H) plus 256 bits of EEPROM. The power to program and read the DS1971 is derived entirely from the 1-Wire communication line. Data is transferred serially via the 1-Wire protocol which requires only a single data lead and a ground return. The 48-bit serial number that is factory-lasered into each DS1971 provides a guaranteed unique identity which allows for absolute traceability. The durable MicroCan package is highly resistant to harsh environments such as dirt, moisture, and shock. Its compact button-shaped profile is self-aligning with cup-shaped receptacles, allowing the DS1971 to be used easily by human operators or automatic equipment. Accessories permit the DS1971 to be mounted on printed circuit boards, plastic key fobs, photo-ID badges, ID bracelets, and many other objects. Applications include work-in-progress tracking, electronic travelers, access control and storage of calibration constants.

Key Features

256-bit Electrically Erasable Programmable Read Only Memory (EEPROM) communicates with the economy of one signal plus ground EEPROM organized as one 256-bit page 64-bit one-time programmable application register is automatically write-protected after programming Reduces control, address, data, power, and programming signals to a single data pin 8-bit family code specifies DS1971 communications requirements to reader Reads and writes over a wide voltage range of 2.8V to 6.0V from -40°C to +85°C

Key Specifications:  iButton Products
Part Number	Overview	Memory Type	Memory Size	Unique Ware	Real Time Clock	Smallest Available Pckg. (mm2)	Price
						max w/pins	See Notes
DS1971	iButton Memory	EEPROM	256 bits	No	No	301	$1.73 @1k
See All iButton Products (26)

Diagram

Application Notes

Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS1971 Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS1971 Application Note 126: 1-Wire® Communication Through Software - DS1971 Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS1971 Application Note 155: 1-Wire® Software Resource Guide Device Description - DS1971 Application Note 159: Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications - DS1971 Application Note 187: 1-Wire Search Algorithm - DS1971 Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS1971 Application Note 244: Advanced 1-Wire Network Driver - DS1971 Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS1971 Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS1971 Application Note 3808: What Is an iButton? - DS1971 Application Note 4255: How to Power the Extended Features of 1-Wire® Devices - DS1971 Application Note 4477: Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V - DS1971

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS1971.pdf

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: 1-6 of 6

DS1971	Notes	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1971-F3+				Active		CAN-F3;2 pin;301 mm² Outline Drawing: 21-0252 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB+3NT*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1971-F3	F3 MicroCan		N/A	No Longer Available	DS1971-F3#	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1971-F5+				Active		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB+5NT*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1971-F5#W				Active		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#5NB*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1971-F3#				Active		CAN-F3;2 pin;301 mm² Outline Drawing: 21-0252 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#3NB*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1971-F5#				Active		CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB#5NB*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis

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