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Status
Part Number	Status
DS1990A	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 140kB) Download   E-Mail

Description

The DS1990A serial number iButton® is a rugged data carrier that serves as an electronic registration number for automatic identification. Data is transferred serially through the 1-Wire® protocol, which requires only a single data lead and a ground return. Every DS1990A is factory lasered with a guaranteed unique 64-bit registration number that allows for absolute traceability. The durable stainless-steel iButton package is highly resistant to environmental hazards such as dirt, moisture, and shock. Its compact coin-shaped profile is self-aligning with mating receptacles, allowing the DS1990A to be used easily by human operators. Accessories enable the DS1990A iButton to be mounted on almost any object, including containers, pallets, and bags.

Key Features		Applications/Uses
Can Be Read in Less Than 5ms Operating Range: 2.8V to 6.0V, -40°C to +85°C Common iButton Features Unique Factory-Lasered 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Traceability Because No Two Parts are Alike Built-In Multidrop Controller for 1-Wire Net Digital Identification by Momentary Contact Data Can Be Accessed While Affixed to Object Economically Communicates to Bus Master with a Single Digital Signal at 16.3kbps Button Shape is Self-Aligning with Cup-Shaped Probes Durable Stainless-Steel Case Engraved with Registration Number Withstands Harsh Environments Easily Affixed with Self-Stick Adhesive Backing, Latched by its Flange, or Locked with a Ring Pressed Onto its Rim		Access Control Inventory Control 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
DS1990A	iButton Memory	ROM Only	64 bits	No	No	ID Only	301	$1.23 @1k
See All iButton Products (26)

Diagram

Application Notes

Application Note 27: Understanding and Using Cyclic Redundancy Checks with Maxim iButton Products - DS1990A Application Note 74: Reading and Writing 1-Wire® Devices Through Serial Interfaces - DS1990A Application Note 126: 1-Wire® Communication Through Software - DS1990A Application Note 148: Guidelines for Reliable Long Line 1-Wire® Networks - DS1990A Application Note 155: 1-Wire® Software Resource Guide Device Description - DS1990A Application Note 159: Software Methods to Achieve Robust 1-Wire® Communication in iButton® Applications - DS1990A Application Note 187: 1-Wire Search Algorithm - DS1990A Application Note 192: Using the DS2480B Serial 1-Wire Line Driver - DS1990A Application Note 214: Using a UART to Implement a 1-Wire Bus Master - DS1990A Application Note 244: Advanced 1-Wire Network Driver - DS1990A Application Note 937: Book of iButton® Standards - DS1990A Application Note 1097: White Paper 2: Using the 1-Wire® Public Domain Kit - DS1990A Application Note 1100: White Paper 5: Using 1-Wire APIs for Data Sheet Commands - DS1990A Application Note 3808: What Is an iButton? - DS1990A

Design Guides

1-Wire® Products (PDF)

Reliability Reports

Request Reliability Report for: DS1990A

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: 1-9 of 9

DS1990A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1990A-F3+			Active	CAN-F3;2 pin;301 mm² Outline Drawing: 21-0252 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB+3NA*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1990A-F3+C0B		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1990A-F3+C80		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1990A-F3+C8F		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1990A-F3/C00+		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1990A-F5+E00		N/A	No Longer Available	Land Pattern: Not Available	-40°C to +85°C	See data sheet
DS1990A-F5+			Active	CAN-F5;2 pin;301 mm² Outline Drawing: 21-0266 (PDF) Land Pattern: Not Available Use pkgcode/variation: IB+5NA*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1990A-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
DS1990A-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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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

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

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