General Description

carrier that serves as an electronic registration number

for automatic identification. Data is transferred serially

gle data lead and a ground return. Every DS1990R is

factory lasered with a guaranteed unique 64-bit regis-

tration number that allows for absolute traceability. The

durable stainless-steel iButton package is highly resis-

tant to environmental hazards such as dirt, moisture,

and shock. Its compact coin-shaped profile is self-

aligning with mating receptacles, allowing the DS1990R

to be used easily by human operators. Accessories

enable the DS1990R iButton to be mounted on almost

any object, including containers, pallets, and bags.

The DS1990R is a fully compatible variant of the

DS1990A. In applications where a presence pulse on

contact is critical, the DS1990R should be preferred

over the DS1990A.

Applications

Access Control

Work-In-Progress Tracking

Tool Management

Inventory Control

Features

♦ Upgrade of DS1990A Guarantees Presence Pulse

on Contact

♦ 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

♦ Presence Detector Acknowledges When Reader

First Applies Voltage

Serial Number iButton

________________________________________________________________

Maxim Integrated Products

1

Pin Configurations

Ordering Information

19-4894; Rev 4; 8/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

DS1990R-F5#

-40

°C to +85°C

F5 iButton

DS1990R-F3#

-40

°C to +85°C

F3 iButton

Examples of Accessories

PART

ACCESSORY

DS9096P

Self-Stick Adhesive Pad

DS9101

Multipurpose Clip

DS9093RA

Mounting Lock Ring

DS9093A

Snap-In Fob

DS9092

iButton Probe

16.25mm

5.89mm

0.51mm

3.10mm

0.51mm

17.35mm

BRANDING

F5 SIZE

GND

GND

IO

IO

F3 SIZE

89

01

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®

u t

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ZZZ DS1990

R

iButton and 1-Wire are registered trademarks of Maxim

Integrated Products, Inc.

#

Denotes a RoHS-compliant device that may include lead(Pb)

that is exempt under the RoHS requirements.