DS1990R-F3# Datasheet DS1990R-F3#, DS1990R-F5# | P1-P3

General Description

The DS1990R 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 sin-

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 i

Button 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

DS1990R

Serial Number i

Button

________________________________________________________________

Maxim Integrated Products

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 i

Button

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

IOIO

F3 SIZE

89 01

000000FBC52B

1-Wire

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.

DS1990R

Serial Number i

Button

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= -40°C to +85°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: All voltages are referenced to ground.

Note 2: External pullup voltage. See Figure 4.

Note 3: System requirement.

Note 4: Full R

PUP

range is guaranteed by design and simulation and not production tested. Production testing performed at a

fixed R

PUP

value. Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the system and

1-Wire recovery times. The specified value here applies to systems with only one device and with the minimum 1-Wire

recovery times. For more heavily loaded systems, an active pullup such as that found in the DS2480B may be required.

Note 5: Capacitance on the IO pin could be 800pF when power is first applied. If a 5kΩ resistor is used to pull up the IO line to

PUP

, 5µs after power has been applied the parasite capacitance will not affect normal communications.

Note 6: Guaranteed by design, simulation only. Not production tested.

Note 7: Input load is to ground.

IO Voltage Range to GND .....................................-0.5V to +6.0V

IO Sink Current....................................................................20mA

Junction Temperature......................................................+125°C

Storage Temperature Range .............................-55°C to +125°C

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IO PIN: GENERAL DATA

1-Wire Pullup Voltage V

PUP

(Notes 1, 2) 2.8 6.0 V

1-Wire Pullup Resistance R

PUP

(Notes 3, 4) 0.6 5 k

Input Capacitance C

(Notes 5, 6) 100 800 pF

Input Load Current I

(Note 7) 0.25 μA

Input Low Voltage V

(Notes 1, 3, 8) 0.3 V

Input High Voltage V

(Notes 1, 9) 2.2 V

Output Low Voltage at 4mA V

(Note 1) 0.4 V

Operating Charge Q

(Notes 6, 10) 30 nC

Recovery Time t

REC

(Note 3) 1 μs

Time Slot Duration t

SLOT

(Note 3) 61 μs

IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE

Reset Low Time t

RSTL

(Notes 3, 11) 480 μs

Reset High Time t

RSTH

(Notes 3, 12) 480 μs

Presence-Detect High Time t

PDH

15 60 μs

Presence-Detect Low Time t

PDL

(Note 13) 60 240 μs

Presence-Detect Sample Time t

MSP

(Note 3) 60 75 μs

IO PIN: 1-Wire WRITE

Write-Zero Low Time t

W0L

(Notes 3, 14) 60 120 μs

Write-One Low Time t

W1L

(Notes 3, 14) 1 15 μs

IO PIN: 1-Wire READ

Read Low Time t

(Notes 3, 15) 1 15 -  μs

Read Sample Time t

MSR

(Notes 3, 15) t

+  15 μs

DS1990R

Serial Number i

Button

_______________________________________________________________________________________ 3

Note 8: The voltage on IO must be less than or equal to V

ILMAX

whenever the master drives the line low.

Note 9: V

is a function of the internal supply voltage.

Note 10: 30nC per 72 time slots at 5.0V pullup voltage with a 5kΩ pullup resistor and t

SLOT

≤ 120µs.

Note 11: The reset low time (t

RSTL

) should be restricted to a maximum of 960µs to allow interrupt signaling. A longer duration could

mask or conceal interrupt pulses if this device is used in parallel with a DS1994.

Note 12: An additional reset or communication sequence cannot begin until the reset high time has expired.

Note 13: Presence pulse after POR is guaranteed by design, not production tested.

Note 14: ε in Figure 7 represents the time required for the pullup circuitry to pull the voltage on IO up from V

to V

. The actual

maximum duration for the master to pull the line low is t

W1LMAX

+ t

- ε and t

W0LMAX

+ t

- ε, respectively.

Note 15: δ in Figure 7 represents the time required for the pullup circuitry to pull the voltage on IO up from V

to the input-high

threshold of the bus master. The actual maximum duration for the master to pull the line low is t

RLMAX

+ t

iButton CAN PHYSICAL SPECIFICATION

SIZE See the Package Information section.

WEIGHT (DS1990R) Ca. 2.5 grams

Detailed Description

The block diagram in Figure 1 shows the major function

blocks of the device. The DS1990R takes the energy it

needs to operate from the IO line, as indicated by the

parasite power block. The ROM function control unit

includes the 1-Wire interface and the logic to implement

the ROM function commands, which access 64 bits of

lasered ROM.

DS1990R

PARASITE POWER

ROM

FUNCTION CONTROL

64-BIT

LASERED ROM

Figure 1. Block Diagram

P1-P3 P4-P6 P7-P9 P10-P10

DS1990R-F3#

Mfr. #:

Buy DS1990R-F3#

Manufacturer:

Maxim Integrated

Description:

Security ICs / Authentication ICs Serial Number iButton

Lifecycle:

New from this manufacturer.

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DS1990R-F3#

DS1990R-F3#

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