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Status
Part Number	Status
DS1972	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 160kB) Download   E-Mail

Description

The DS1972 is a 1024-bit, 1-Wire® EEPROM organized as four memory pages of 256 bits each in a rugged iButton® package. Data is written to an 8-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, the four memory pages can individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. The DS1972 communicates over the single-conductor 1-Wire bus. The communication follows the standard Dallas Semiconductor 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the device. The registration number is used to address the device in a multidrop 1-Wire net environment.

Key Features		Applications/Uses
1024 Bits of EEPROM Memory Partitioned into Four Pages of 256 Bits Individual Memory Pages can be Permanently Write Protected or Put in EPROM-Emulation Mode ("Write to 0") Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise IEC 1000-4-2 Level 4 ESD Protection (8kV Contact, 15kV Air, typical) Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C Communicates to Host with a Single Digital Signal at 15.4kbps or 125kbps Using 1-Wire Protocol		Access Control/Parking Meter Inventory Control Maintenance/Inspection Data Storage Tool Management Work-in-Progress Tracking

Key Specifications:  iButton Products
Part Number	Overview	Memory Type	Memory Size	Unique Ware	Real Time Clock	Features	Smallest Available Pckg. (mm2)	Price
							max w/pins	See Notes
DS1972	iButton Memory	EEPROM	1K bits	No	No	EPROM Emulation Mode	301	$1.73 @1k
See All iButton Products (26)

Diagram

Application Notes

Application Note 114: 1-Wire File Structure - DS1972 Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS1972 Application Note 159: Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications - DS1972 Application Note 4255: How to Power the Extended Features of 1-Wire® Devices - DS1972 Application Note 4477: Reference Design of a 1-Wire® Bidirectional Voltage-Level Translator for 1.8V to 5V - DS1972

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Reliability Report: DS1972.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: 1-4 of 4

DS1972	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1972-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
DS1972-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
DS1972-F5#		N/A	No Longer Available	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
DS1972-F3#		N/A	No Longer Available	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

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Technical Documents

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

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

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